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Solution and Kinetic

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Solution and Kinetic

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"Aakash Educational Services Pvt. Ltd. Re Chapter 7 (1) Urea (2) Acetic acid (3) Both urea and acetic acid (4) Either of these depending upon experimental conditions Solution SECTION -A 4. A glucose solution weighing 200 g contains 36 Q we i OU ees ‘ater. The molal concentration of solution is The bolling temperature and composition curve of (1 184, 1000 (a 200, 1000 “water ethanol solution is given below. 180 36 180" 200 36 1000 164 4000 (3) =~ x—— —x— ° ©) 380" 555 ® 480” 200 5 pga 5. 1 kg of 0.3 mole glucose solution in water is ge 8 cooled to ~ 3.2°C. What weight of ice would be 5 Separated out if a solution containing 50 g ethylene glycol in 0.2 kg water freezes at -9.3°C? © Mole fraction of B 1 0 mus @) 84g At point ‘C’, the mixture has ethanol 95.8% by (3) 50g @) 37.29 weight in vapour phase. If this solution is boiled at, Correct order of depression in freezing point of 78.13°C, then percentage by weight of water in following aqueous solutions liquid phase is (boiling temperature = 78.13°C) A. 0.1 MNaCl B. 0.1 NBaCl, (1) 95.8% 2) 4.2% C. 0.3MGlucose —D. 0.1 MK,{Fe(CN)] (3) 80.8% (4) 43.5% : (1) D0&AS>0 (2) AH0 (3) SH<0&AS<0 (4) AH>0&AS<0 A liquid (v.p. = 100 mm Hg) is transferred from a vessel of 100 ml capacity to 1000 mi capacity, hence its vapour pressure 41 42. 43. 45. 46. re Last Leap for NEET (Pay (1) Increases 10 times 1 (2) Decreases 75th times (3) Increases 100 times (4) Remains as such Molarity of liquid nitric acid, if density of it, aqueous solution is 0.95 g/cc (1) 15 @) 95 (3) 015 (4) 0.95 Calculated molecular mass is greater than ‘observed molecular mass for which of the given set of examples? (1) 1 MygMgCl,, 1 Myq Urea, 1 M,, Sucrose (2) 0.1 Myg Al,(SO,)y, 0.1 Myq NaCl, 0.1 M aoetc acid in benzene 3) 0.1 M,, HCI, 0.1 Mj, H,SO,, 0.1 M,, Ca(OH), (4) Both (2) & (3) When HNO, is mixed in HO, which of the following set of information will be correct? (1) Pat > Pano, + Piyor AMiie = VE 2) HNO, - H,0 interaction > HNO, — HNO, interaction, AS,,. > 0 8) ASjig <0, Vinge < 0 (4) AH py, <0, it forms minimum boiling azeotrope Following solutions are given below |. Centimotar magnesium bromide solution Il. Centinormal potassium chloride solution I. Normal solution of urea IV. Molar solution of aqueous benzoic acid Correct order of freezing point is given below as (1) W>tvetou @) l>t>wel (8) >> tot (4) W>t> tev Ebullioscopic constant calculation depends upon (1) Freezing point of solvent (2) Molecular mass of solute (3) Enthalpy of vapourisation of solvent (4) All of these ‘Aakash Educational Services Pvt. Ltd. Regd. Office : Aakash Tower, 8, Pusa Road, New Delhi10005 Ph. 17623486, Last Leap for NEET (Part-ll) 47. 49, 50. 51 53. ieee ‘1% solution of a non electrolyte having molecular mass approximately 69 is isotonic with 5% (wiv) solution of (1) Urea (2) Glucose (3) Potassium chloride (4) Sucrose Vapour pressure of pure water, if lowering of vapour pressure becomes 0.125 torr when 50 g of cane- sugar is added to 0.5 litre of water is approximately (1) 0.03 atm (2) 238 atm (3) 30am (4) 2.3 atm When placed in hypotonic solution, plant cell will (1) Remain as such (2) Shrink (8) Swell (4) Both shrink and swell What will be the concentration of chloride ion when 100 ml of 0.1 M AgCl is mixed with 200 ml of 0.05 MBaCl, solution? (1) 01M 2) 0.05 M (@) 02M (4) 001M In which of the following boiling point will not be increased? (1) Addition of KI in 1 M glucose solution (2) Addition of KI in 1 M urea solution (8) Addition of KI in 4 M Hgl, solution (4) Addition of KI in 1 M NaCl solution 10 g of a non-volatile solute when dissolved in 400 g benzene raises its boiling point by 1°. Molecular mass of the solute is (K,, for benzene = 2.53 Kg mot) (1) (2) 253 (3) 4 (4) 180 If an aqueous solution of sugar is allowed to freeze, then crystals of which will be separated out first? (1) Sugar 2) Water (3) Sugar + glucose (4) Glucose + Fructose 54. 55, 87. 59, Solution 77 Which of the following is correct? Ply (1) P.T=i0e 8 1+T, 273+t (2) Po =P, oar ( 273 ] Poxt (3) Py =Pp +22. 3) PL=Po+ 273 (4) All of these Which of the following is correct? (1) Solubility of CO, in water is explained by Henry's law (2) Henry's law can be applied even at very low temperature (3) Henry's law cannot be applied in solubility of ©, in blood (4) Both (1) & (3) 18 g glucose and 34.2 g sucrose are added in one litre water, the osmotic pressure of solution at 27°C is (assume no volume change) (1) 49 atm 2) 24 atm (3) 9.6 atm (4) 3.55 atm ‘An aqueous solution of AB has boiling point of 101.8°C when it is 100% ionised. The freezing point of the same solution is ~1.80°C. Hence AB (KyK, = 0.3) (1) Is 100% ionised at freezing point of solution (2) Is 50% ionised at freezing point of solution (3) Neither dissociated nor associated at freezing point of solution (4) Forms a associated molecule at freezing point of solution Which has maximum molal depression constant? (1) 0.1 Mag. KCI (2) 0.1 Mag, sodium sulphate (3) 0.2 Mag, barium phosphate (4) Same for al ‘What will be the resultant osmotic pressure if 300, mi of solution with osmotic pressure 2 atm is mixed with 200 mi of same solution with osmotic pressure 3 atm, at 27°C? Q) 3atm (4) 2.4 atm (1) 2atm @) 25 atm a 78 Solution 60. A solution of W g urea in 500 g of water is cooled (0 -0.5°C, 128 g of ice separates out. What Is the value of W? (K, for water = 1.86 K kg/mol) () 4g (2) 6g @) 5g (4) 89 61. Solubility of a gas X in waler increases by lowering the temperature. This means that (1) Dissolution process is endothermic 2) Dissolution process is independent of temperature 8) ASssorson * © (4) AH, 0 62, The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to lasso1uion < (1) Ionization of benzoic acid (2) Dimerization of benzoic acid (3) Trimerization of benzoic acid (4) Solvation of benzoic acid 63. Van't Hoff factor of 80% ionised Hg,Cl, in its aqueous solution will be (1) 1.6 (2) 2.6 @) 36 @) 46 64, Assuming the salts to be unionised in solution. Which of the following has the highest osmotic pressure? (1) 1% (wv) Cscl (2) 1% (wlv) RbCl (3) 1% (wiv) KCI (4) 1% (wiv) NaCl 65. Which of the following is an intensive property? (1) Boiling point of the solution (2) Freezing point of the solution 3) Osmotic pressure (4) All of these 66. A solution containing 30 g of a non-volatile solute exactly in 90 g water has a vapour pressure of 2.8 kPa at a given temperature. When 18 g of water is added to the solution, the new vapour pressure becomes 2.9 kPa at the same temperature, the molar mass of the solute is (1) 34g mot (2) 23 g molt (3) 46 g mot" (4) 17g mol" Aakash Educational Services Pvt. Ltd. Regd. Office : Aakash Tower, 8) PUk 67. 69. 70. n 72. Lost Leap for NEET (Par ty Solution A is 1 M of toluene in benzene but g is 1 m of toluene in benzene having dens, 0.85 gicc, then correct statement (1) bp. of A< bp. of B 2) bp. of A> bp. of B @) bp. of A= bp. of B (4) fp. of A= fp. of B IF t moles of a solute which dimerises is dissolveg in one L-water, then degree of association o, jg given by Ky 2Kpt- AT) =e @) a= 2Kot= 4%) () ange @) nat 2AT» ay @) a=20ee ) oF Solvent which is better to be used during ebullioscopic measurement has (1) High K, (2) Low k,, @) K=K, (4) Unpredictable 0.9 gm of a hydrocarbon with molecular formula H,(CH,), when dissolved in 180 gm of solvent freezes at 8.48°C. If freezing point of pure solvent is 9°C, then the formula of hydrocarbon is (K, = 12 K kg mot) (1) CH, @) Coty 8) CeHig (4) CH 0.5% (w/v) aqueous solution of KCI was found to freeze at — 0.24°C. The degree of dissociation of the solute at this concentration will be (K, for H,0 = 1.86 K kg mol) (1) 74.5%. 2) 19.2% @) 92% (4) 48% Select the correct statement (1) Freezing point, boiling point and vapour Pressure are all colligative properties (2) The freezing point, boiling point and vapour Pressure all decrease when a solute is dissolved in a solvent (3) Plots of freezing point versus molal Concentration for ethyl alcohol, propyl alcohol and butyl alcohol dissolved in water will all be linear with different slopes (4) All are incorrect Road NeW Dehi4H 0005 Rott A7625488) Last Leap for NEET (Part) 73. The vapour pressure of two liquids A and B are 100 and 80 torr respectively. The total pressure of the solution obtained by mixing 2 moles of A and 3 moles of B would be (1) 20 torr 2) 36 tor @) 88 torr (4) 180 torr 74. Which of the following is the correct order of boiling points of the following solutions? (Assume ‘complete dissociation of salts) a. 0.15 M NaCl b. 0.4 M glucose solution c. 0.15 M CaCl, solution dd. 0.15 M urea solution () d Choose the correct option(s) : (1) Depression in freezing point = T, - T, (2) Elevation in boiling point = T, ~ (3) Boyle temperature = T, — (4) All are correct 200 mL of an aqueous solution of a prote Contains 0.63 g of the protein. The osmott Pressure of such a solution at 27°C is found tobe 2.87 * 10° bar. What will be the approx mola mass of the protein? IR = 0.083 L bar molt ky (1) 61022 g mot 8) 152555 g mot (2) 30520 g mor (4) 122044 g mot" Oe: Aakash Tver, 8, Pus Road New Dali oo08 PRR TOM Lest 96. 97. 100. 101. Leap for NEET (Part) 31. of ethylene glycol (C,H,0,) is mixed with 500 g of water. What will be the freezing point of water? [K, for water = 1.86 K kg mol-t] (1) 269.14 K (2) 271.29K (3) 275.01 K (4) 273.95 K Which is true about azeotropic mixture? (1) [tis a constant boiling mixture (2) Vapour phase composition and liquid phase composition are same (@) Cannot be separated by simple distilation (4) Allare true If two solutions have same osmotic pressure then the solution are said to be (2) Isotonic (4) Isobaric (1) Hypertonic (3) Hypotonic The magnitude of heat of solution on addition of solvent to solution (1) Decreases (2) Increases (@) Remains constant (a) Increases or decreases If mole fraction of the solvent in a solution decreases, then (1) Vapour pressure of solution increases (2) Boiling point decreases () Osmotic pressure increases (4) All are correct statements Which one is isotonic with 3 M NaCl aq. solution? (1) 3M Urea (2) 2MBaCl, @) 1MAICI, (@) 2MKCI Consider the following 0.01 M aqueous solutions a Kel I. CaCl, IM. Glucose The relative lowering of vapour pressure will be in the order (1) >t @) atom (2 pile > > lL “Aakash 8 Solution 102. Which of the following solution has maximum 103. 104. boiling point? (1) 0.1 MKNO,, (2) 0.01 M CH,COOH (3) 0.5 Murea (4) 02 MK,[Fe(CN) If 25.6 g of sulphur is dissolved in 100 g benzene, solution shows depression of freezing point of 5.12°C. If (Ky)genzene (8 5.12°C kg/mol, then the best possible structure of sulphur molecule may be given as (Atomic weight of S = 32 9) (1) Monoatomic molecule, S (2) Diatomic molecule, S. () Crown shape, S, (4) Polymeric shape, S, 0.5 molal aqueous solution of KCl, MgCl, and FeCl, have freezing points T,, T, and Ts respectively. Which of the following is correct? (1) T)>T2>Ts Q) T3>T>T, @ T>T,>T; () T,>T > T SECTION -B Assertion - Reason Type Questions In the following questions, a statement of assertion (A) is followed by a statement of reason (R) (1) If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1). If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2). If Assertion is true statement but Reason is false, then mark (3). If both Assertion and Reason are false statements, then mark (4). ‘A Ethanol water mixture forms minimum boiling azeotropes. R : 95.4% ethanol in water (by volume), the liquid and vapour have the same composition, and no further separation occurs. A: CyHg| and C,H,Br form ideal solution R: The interaction between the components are similar to those in the pure components. odd, New Dalhi410005 Ph.011-47623456 @ 82 Solution 3. and vapour state depending upon the volatility Of components, : Composition in both, liquid and vapour phase depends upon volatility of the substance. + A liquid mixture which distil with change in composition is called Zeotropic mixture. : Non-ideal solution forms Zeotropic mixture at composition other than a Zeotropic point. Q Q Qa A: Azeotropes have different composition in liquid 5. A RES A ’ Last Leap for NEET (Part : When 100 ml of A mixed with 25 ml of B then total volume cannot exceed 125 mi. Intermolecular forces between A and Big always stronger than pure A or pure B. : Raoult’s law for the solution of Non-volatilg solute can be given as P°-P, on Poon s 'solute solvent * Msolute : Raoult’s law is not applicable for the Solution of FeCl, in water. Chapter 8 Chemical Kinetics ase to CN HERESIES EEE SECTION - A Objective Type Questions 4, Which of the following statement(s) is/are correct regarding Arthenius equation? (1) IFE, = 0, then 100% reactant will convert into product @) If Tis equal to infinite, then 100% reactant is converted into product (3) E, cannot be negative (4) All of these 2. At particular concentration, the half life of the reactant is 100 minutes. When the concentration of the reactant becomes 10 times, the half life of the reaction becomes 60 seconds, then what will be the order of reaction? “4 Q2 (8) Zero 4) 3 3. The rate constant of the given reaction, R(g) —4-> 2P(q) is 2.48 « 10% - A141 molar ratio of R to P in the reaction mixture is attained after (1) 32 min (3) 20 min 4. A graph drawn between concentration of reactant (a— x) and time ‘tis found to be a straight line. The reaction is of 2) 27.3 min (4) Omin (2) Zero order (4) Second order (1) First order (3) Third order 5. A frst order reaction, which is 80% completed in 30.2 minutes has a half life period of (2) 58.2 min (4) 120.2 min (1) 102.2 min @) 30.2 min 6 10. "1 sh Tower, 8, Pusa Road, New Delhet10005 Prot 47 For a reaction: A— B. o ‘The graph is plotted between loot (Y-axis) and log (a — x) (X-axis). The slope of the line is found to be 45°. The order of reaction will be dx [where — rate, (a— x) + cone. of reactant at at time 't] (1) Zero (2) One (@) Two (4) Three ‘The unit of rate constant of second order reaction is (1) s* @) mol L-* s* @) mortL st (4) mor? L? s? For a first order reaction, intial concentration is 2.5 M, rate constant is x 5~', then ty, for the reaction is (ty 0.693 @ 1,386 x x (2) 0.3465 s 28. If rate constant at 310 K for a reaction is 100 and rate constant at 300 K for a reaction is 40, then ‘temperature coefficient is (1) 1.03, @ 35 8) 25 (4) 0.40 For a zero order reaction, the initial amount of reactant is 20 g and halflife is 30 minutes. The of reactant left after 60 minutes would be amount (1) 59 2) 109 (@) 259 (4) Zero For an exothermic chemical process occurring in two steps as follows () A+B>Y (slow) (i). ¥ > AB (fast) 84> Chemical Kinetics 12. The process of reaction can be best described by 4 PE, ) 7 AtB Reaction co-ordinate AB me @) 7 A+B AB Reaction co-ordinate PE @) A+BY AB Reaction co-ordinate PE. (4) Y A+B Reaction co-ordinate For the first order gas phase decomposition reaction Aig) + Big) + C(g) If P, is the initial pressure of A and P, is total pressure after time t, then correct relation is 13. 14, 15. 16. Last Leap for NEET , — Zero order (1) Rate Cone. (2) tye — First order Cone. Second order dis (@) Time (4) tye — Third order Pan A hypothetical reaction X, + Y, > 2XY follo the mechanism as given below “s X, = 2X (fast) X+Y, > XY + Y (slow) X+Y > XY (fast) The order of the overall reaction is (4 @ 15 @) 2 (4) 3 For a zero order reaction, a graph of [A] versus is linear and have (1) Negative slope and non-zero intercept (2) Negative slope and zero intercept 3) Positive slope and non-zero intercept (4) Positive slope and zero intercept The rate constant of a reaction is 3x 10? md si Hence, the order is qi) 4 (2) Zero (3) 2 4) 3 Which is mismatched? Last Leap for NEET (Partll) 47. Rate constants of forward and backward reaction of A==5 is 3.25 « 10° and 1.62 « 10+ respectively. The equilibrium constant is M2 @) 2 1 1 @5 4 2 48. A reaction mixture has been made by taking equal concentration of two reactants. It takes 40 minutes for the completion of 50% of the reaction. For the completion of next 50% of the reaction time taken is 80 minutes. What is the order? (1) Zero 21 (3) 2 a3 49. In the reversible reaction 2NO, == N,O,, the rate of disappearance of NO, is equal to 2K, 2 = no, O) & INO,} (2) 2K, [NO,P — 2K, [N,O,] (8) 2K, [NO, — K, [IN,O,} (4) Ky INO,P ~ K, [N,O,] 20. Half life of a reaction is found to be inversely proportional to the cube of initial concentration. The order of reaction is (1) 3 @2 @4 (4) 5 21. Which of the following statement (s) is/are incorrect? (1) The rate of a reaction is same at any time during the reaction (2) The rate of a reaction is independent of temperature change (3) The rate of a reaction decreases with increase in concentration of reactant(s) (4) All of these 22. For a particular reaction, 2A + B > Products, it is seen that when the concentration of only B is doubled, the half life did not change but when the Concentration of only A is doubled the rate of feaction increased by two times. The unit of rate constant for this reaction would be (1) mol L-t 4 (2) s* ©) L mot 54 (4) Unitless. Chemical Kinetics | 85 23. A graph is plotted between half life and concentration. ty i cone The order of the reaction will be (yo (2) 1 @) 2 @ 3 24. For a first order kinetics, the time required for 75% completion is of its halflife 3 3th (2) Twice 3 Sth (3) Half 5 25. Which of the following remains unchanged when a catalyst is added? (1) Enthalpy of reaction (2) Activation energy (3) Rate constant (4) Reaction rate na second order kinetics, the volume of reaction vessel is halved at constant temperature, the specific reaction rate (1) Remains constant (2) Increases by 4 times (3) Becomes one fourth of initial (4) Increases but less than 4 times 27. Inthe given reaction PCI,(g) —> PCI(g) + Cl(g) initially only PCI,(g) is present at 1.5 atm. After 10 minutes the pressure becomes 2.5 atm. The rate constant of the reaction will be (in minute) 5 (1) 0.2303 boas (2) 0.2303 log3 @ 0.280309¢ ) 0. 29031002 © The reaction, A,(g) > B(g) + fo, shows increase in pressure from 100 mm to 120 mm in 5 minutes. The rate of disappearance of A, is (1) 4mm min 2) 8 mm mir 3) 16 mm min-* (4) 2mm min Road) N en, 8, Pus 2 34 32, 33. Chemical Kinetics The rate expression for a reaction is R = K[H"] [X]. 1 pH is increased by one, the reaction rate is (1) Increased by 10 times (2) Decreased by 10 times (3) Increased by 2 times (4) Constant ‘The decomposition of a substance ‘R’ takes place according to first order kinetics. Its initial 1 Concentration is reduced to th in 24s. The rate constant of the reaction is 0.694 16 (2) . 4% The two reactions are given below A—+B + energy C + energy —> D If the temperature is increased, then what is the effect on reaction rates in both reactions? (1) Both rates are increased (2) Both rates are decreased (3) InA—> B, the rate is decreased and in C —> D, the rate is increased (4) In A——» B, the rate is increased and in C— D, the rate is decreased For study in chemical kinetics, following relationship is observed ink (oot) = 124-20 the activation energy (in cal) of the reaction will be (1) 2.308 x 8.314 x 800 (2) 2.303 x 2 x 800 (8) 8.314 x 800 (4) 2 * 800 For a gas phase reaction, following rate law is observed KAR (BP when conc. of A & B both become double the rate is increased by y times and when volume of container is tripled the rate is decreased by 27 times the value of x and y are respectively 21.9 (4) 2,9 (1) 2.8 36. 37. Last Leap for NEET (Pan In the given reaction OH NO, ie ky O HNO, rd 5 OH Hao NO, the fraction of p-nitrophenol in overall amount g product will be KG OK Ky -Ke — aa @ ~K, 4 KK, Kooe If the ratio of rate constants is equal to 2, Kzorc Kroc the value of jg should be 20°C a 1 (1) 2 > 1 @4 4) 4 In a reaction, when concentration is increased by four times, rate constant remains unchanged, the order of reaction will be ao (2) 3 (@) 2 (4) Any order The value of rate constant depends on (1) Presence of catalyst (2) Temperature (3) Change in concentration of reactants (4) Both (1) & (2) For a third order kinetics, which of the following relationship is incorrect? 1 Cee a 2) Fs (cone)? (3) K is independent to concentration (4) All of these A substance ‘A’ is 20% decomposed in 1 hr following 1st order kinetics. The percentage of ‘A’ left after 3 hr will be (1) 81% (8) 51.2% (2) 60% (4) 20% Last Leap for NEET (Part!) 40. In-an exothermal reaction A > B, The activation energy of reverse reaction is three times that of forward reaction. If enthalpy of the reaction is 80 kJ mol", the activation energy of the reverse reaction is (1) 120 kJ molt 2) 40 kJ mort @) 80k mo (4) 160 kJ mort 44. Decompositon of H,O, is a first order reaction. To determine the rate of reaction initially 10 ml of standard KMnO, solution are required and after 10 min, 5 ml of KMnO, solution are required, the rate constant will be (1) 693 het (2) 0.0693 min-* (3) 56 mint (4) 0.015 min 42, Which of the following graphs represents first-order reaction? t t 7 top -2 Lg a. a to to t t te = o Ui. N. 3 a t= (1) 1&ll 2 Lael @ lav (4) ma&iv 43, Kinetics of decomposition of H,O, is studied by volumetric measurement of concentration of H,O, by standard KMnO, solution at different time interval. If 20 ml of 0.2 N KMnO, is required at start and after 10 minutes 10 ml of 0.2 N KMnO, is required then rate constant K of [H20,] is 2. (1) 280 16) 2) “Jp 09 (2) 2.303, @) =p e908) 4) log (4) In a first order kinetics, if the concentration of reactant is halved and temperature is increased by 20°C from initial, the reaction rate will be (assuming temperature coefficient equal to 2) (1) Unaltered (2) Twice of initial (3) 8 times of initial (4). 4 times of initial —_ ee 46. 41. 49. 50. 87 Chemical Kinetics For decomposition of ammonia on tungsten surface (1) Half life period is dependent on initial concentration 2) K= 2808 jog 2 t a-x (3) tooo iS equal to 10 half life (4) Both (2) & (3) 5 g rat ictive substance is taken in 1 L flask. How much substance will be left after 100 years, if half life of substance is 25 years? (1) 259 (2) 1.59 (8) 0.625 g (4) 0.31259 For the reaction 2NO + Br, > 2NOBr Mechanism given is NO + Br, = NOBr, (fast) NOBr, + NO > 2NOBr (slow) Then which of the following is true? (1) Order of the above reaction is less than molecularity of reaction (2) Order of the above reaction is equal to molecularity of reaction (3) Order is greater than molecularity of reaction (4) Relation between order and molecularity cannot be predicted If the initial conc of unity is reduced to half in 25 ss for a zero order reaction, then rate constant will be (1) 0.027 mol L-'s*— @) 0.027 s* (3) 0.02 mol L-1 s* (4) 0.02 L mort s+ If for a I order reaction, k = 8.5 x 105e-18000 KT the energy of activation is given by (1) 150 kd/mol (2) 125 kdlmol 3) 50 kiimol (4) 500 kJimol For the reaction; 2A > 4B + C, Ata given time if rate of formation of B is given by x mollL/s. Then rate of change of concentration of ‘at that time and rate of reaction at that time can be given respectively by (Q) -2x, x @ “2.5 BB Chemical Kinotics 51. For the elementary gaseous reaction 2P + Q — 3R. How the rate is affected if the volume is made triple? (1) Rate increases 9 times (2) Rate increases 27 times @) Rate decreases 27 times (4) Rate remains unchanged 52. If for an endothermic process, A+B C+D—30 kJ/mol, the activation energy for the forward reaction is 95 kJ/mol, then the activation energy for backward reaction will be (1) 95 kJimot (2) 65 ksimol B)_ 125 kulmot (4) 30 kJimot 53. If for the reaction As+ B — Product, order with respect to A and B is respectively 1.5 and zero. Then in the given table x and y will be respectively oo: | 001 | 50 x | 0015 | 50 (1) 0.02, 5.0 2) 0.01, 14 (3) 0.02, 14 (4) 0.01, 5 54. Exp. [A] (8) Initial rate i 0012 0.035 4 fi, 0.024 0.070 08 ii, 0.048 0.070 16 The rate for A + B — Products will be (1) Rate = K(A? (2) Rate = K(B)? (3) Rate = K(A\B? 4) Insufficient data 55. Consider the following statements i. First order reactions follow an exponential time course ii, If curve is plotted t,,. against [Cy of reactant is a straight line passing through origin then it will be of zero order reaction iil, Rate of reaction is always proportional to the concentrations of reactants Of these statements (1) i, i, ii are correct (2) i and ii are correct (3) ii, ii are correct (4) i and ili are correct, 56. The half life of a first order reaction is 10 minutes. If experiment is started with 0.08 molfitre, then time taken to reduce the concentration to 0.01 mol/ litre (1) 10 minute (3) 20 minute (2) 30 minute (4) 40 minute ‘Aakash Educational Services Pvt. Ltd. Regd. Office : Aak 87. 61 62. Lost Leap for NEET (Pag It activation energy of forward and reverse are 36.8 kilmole and 91.3 ksimole. Then reacey is (1) Exothermic (2) Endothermic (3) Independent of temperature (4) Neither exothermic nor endothermic For two reactions, activation energies are E,, an, E,, and rate constants are K, and K, at sang temperature. If K, > K,, then (1) Ea, > ay (2) Ea, 2NH,(Q). Ii 10 g H, were taken and after 10 s, 34 g NH, ig formed, then rate of reaction (assuming volume of container is 1 L and N, is present in excess) (1) 0.067 mol L-'s*" (2) 0.2 mol L-'s* (3) 2 mol L's (4) 0.5 mol ts 7 For any first order reaction faa ig tye 1 a4 Qs (3) 2 @) 3 The slope of plot for the reaction N, + 3H, — 2NH, would be equal to x g a+ Cae () aaa Ey @) 2303 Ea OR (4) This type of plot is nat possible The rate constant of a reaction has samé dimension as rate of reaction. The reaction is (1), Zero order (2) 1% order 3) 2” order (4) 3% order ash Tower, 8, Pusa Road, New Dehi-t10005 Prott-4762346 Last Leap for NEET (Part) 63. A graph plotted between log K versus 1/T for calculating activation energy is shown by + log KI ) wt t log K) @ ut t log K| _, @) ie + log cela eee 4 Vi 64. On plotting a graph between concentration of product and time for calculating the instantaneous rate of reaction, the graph has (1) Positive slope (2) Negative slope (3) Both (1) & (2) (4) Cannot predicted 65. For the first order reaction, which one is not correct? (1) tag = 2 * te 2) typ = Ste @) toon = 102 (4) too = 2-5tre 66. X—3 Y (K, = 101.6507) X—9Z (K, = 106-17) At what T both K, and K, are equal? 500 K (1) 500K 2 4 606 4.606 3.303 k 500 (4) “5000 67. Reaction A + B —> C + D + 38 koal has activation energy 20 kcal. Activation energy for the reaction C+D A+Bis (1) 20 kcal (2) - 20 kcal (3) 18 kcal (4) 58 kcal 68. 69. 71. so” Chemical Kinetics For a reaction, A(g) > B(g) Following data were obtained at 37°C for above reaction Pressure of Ainmmtg | 1 20 ae Half life (ty) (colatve) | ® dallas The order of reaction is. 4 @2 (3) 3 (4) 4 Which of the following graph is incorrect? ' {Zoro ordor_ 1 order Rate () L__, a | zee IP eH 8) tia Rate constant of a first order reaction is dependent on, (1) Time (2) Temperature (3) Concentration of reactants (4) All of these Consider the following graphs t |, New Dehi-110005 Ph off ATEASHS6) 90 Chemical Kinetics Last Leap for NEET Pan ‘Which of the above graphs represents the 1st order G4 reaction? (1) Only (i) (2) Only nt (3) Only (iy (4) i) & diy “ ake 72, For the reaction M+N A+B, energy of Ripachan Sooraane activation is AG4 wacnt @) rons ee nity Reaction coordi AGe (1) x @Qy [> @) x+y (4) xty-z @) ae bn Reaction coordinate” 73, For any n® order reaction, “4 depends on AGs hie (1) Concentration of reactant always (2) Concentration of product always. @ Product (3) Order of reaction Reactant (4) Pressure only 74. The gas phase decomposition of A as A(g)—>28(g) + C(g) follows first order kinetics and pressure measured after 15 minute and infinite time are 205 and 450 mm of Hg respectively, in a constant volume container at a constant temperature. Calculate the total pressure inside the flask after 50 minute. (1) 122.5 mm (2) 293.26 mm (3) 150 mm (4) 50 mm 75. Diazonium salt decomposes as on — At 0°C, the evolution of N, becomes four times faster when the initial concentration of the salt is, increased four times. Therefore, it is (1) A first order reaction (2) A second order reaction (3) Zero order reaction (4) A third order reaction Cl+N, 76. Which of the following reaction energy diagrams best represents a reaction in the forward direction, that is non-spontaneous with two intermediate states? ee _, Reaction coordinate 77. Which of the following statements is true? (1) The existence of certain intermediates in a reaction mechanism can sometimes be proven because intermediates can sometimes be trapped and identified (2) Intermediates in a reaction mechanism cannat be isolated because they do not have finite ie times (3) Reaction mechanisms cannot have more than one intermediate (4) Intermediates in a reaction mechanism appeat in the overall balanced equation for the reaction 78, The reaction rates for many spontaneous reactions are actually very slow. Which of the following isthe best explanation for this observation? (1) The standard entropy change is < 0 (2) The activation energy is high (3) The standard free energy change for the reaction is > 0 (4) These reactions are endothermic 79. Gaseous N,O, decomposes according to thé following equation N,0s(a) —>»2N04(0)+ L0,(9) ~ANLOs _ qu, 04) The experimental rate law is at Last Leap for NEET (Part-!) at 82 83, Ata certain temperature the rate constant is Helse ay satin how many seconds wil the IO, decrease to it concontatin one-tenth of its (1) 2* 108s 2) 46 « 109s (3) 2.1% 10? s (4) 14% 1035 Nitrogen monoxide NO, reacts with produce NO, and O, ee NO(g) + O3(g) NO, (g) + 0, (g) Consider the following mechanism for the reaction a. 03(9)—02(g) + O(g) (slow) b. NO(g)+O(g)——>NO,(g) _ (fast) Which one of the following rate laws would be consistent with the mechanism proposed above? (1) Rate = KINO} {0} [,] (2) Rate = KINO] (3) Rate = k[NO] (0,] (4) Rate = k[O3) A and B are two different chemical species undergoing first order decomposition with rate constants k, and kg which are in the ratio of 3 2 respectively. If the initial concentration of A and B are in the ratio of [Aly : [Bl = 3 : 2. What would be the ratio of [A] : [B] after three half lives of A? (4:4 Q) 3:4 @) 1:2 (4) 2:1 For the zero order reaction, A—> 2B, the rate constant is 2 x 10-° M min-1. The reaction is started with 10 M of A. What will be concentration of A after 2 days? (1) 7.56 M @ 910M @) 8.500 M (4) 9.994 M For a given first order gaseous reaction, if initial pressure is P, and after t minutes total pressure becomes P, then the rate constant K is A,(9)— nag) Fo mP, -P, ) K=tin 84, 85. 87. 88. 89. Chemical Kinetics | 91 For the reaction, 3A —> Product, the rate law is, rate = k{AJ?. Half life of reaction is given by (1) te & [A] 2) te “ai = @) tae ® tania Consider a reaction aG + bH —> Products. When Concentration of both the reactants G and H is doubled, the rate increases by eight times. However when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of reaction is (1) 0 @1 @) 2 @ 3 For a first order homogeneous gaseous reaction, A—> 2B + C, then initial pressure was Pi while total pressure after time t was Pt. Thus the rate constant K for the reaction would be 2.303, 2P, oy 62a) (4) tye = [AP BRR, @ K For a zero order reaction the initial amount of reactant is 100 g and its half life (ty) is 20 minute, The amount of reactant left after 40 minute will be (1) Zero Q 259 @) 1259 @) 509 ‘The half life of a first order reaction is 69.3 second. ‘The value of the rate constant of the reaction is (ist Q@ 01st 3) 0.01 s+ (4) 0.001 s* The time of completion of 90% of a 1st order reaction is approx (1) 1.1 times that of half life (2) 2.2 times that of half life 3) 3.3 times that of halflife (4) 44 times that of half life ‘BalhiA10008 Ph 011-47625456 -ssspakas Educational Sepices, Putt. °0° 92 Chomical Kinotics Last Leap for NEET g u Ne(g)+ 3H 96. Choose the incorrect statement a MG eee ee aie mcl (1) Catalyst alters the rate of reaction by chang q disappearance of NH,(g) will be 4 (1) KyINGIH,P ~ K,INH,]° (2) e9RT is fraction of molecules with eng (2) 2K, INHF ~ 2K NIP equal or greater ae . nd ty» of first order reaction is hi (2) KING ~ KyINGIHSP a aot . 2 (4) 2KjINZITH,? ~ KINH,P (4) All of these 91. In Arrhenius’s equation K = Ae‘a®1. A may be 97 The following chemical reaction is of Zero order, termed as the rate constant at high pressure 1) Very low te r ‘ (1) Very low temperature 2NH,(g) —pS2K > Na) + 3H,(6) (2) The boiling temperature Choose the correct option(s) for the reaction (8) Zero activation energy (1) Rate of reaction is proportional to th, (4) Very high activation energy concentration of NH, 92, Time required for completion of 99.9% is (2) Unit of rate constant is mol L“! s* times of half life of the first order reaction @) Halflfe of the reaction is independent « (1) 2 (2) 4 concentration of NH, (@) 10 4 (4) Allare correct 1 93, 87.5% of a first order reaction is completed in 98. A first order reaction is 30% completed in % 45 minute. The time in which 99.9% of the minute. How much time will it require for 100% reaction will be completed is completion? (1) 120 minute (2) 60 minute (1) 100 minute (2) 90 minute (3) 150 minute (4) 100 minute (3) 60 minute (4) Infinite 94. Which of the following graph is correct for 1" order 99 Consider the following chemical reaction: reaction? 58r/(aq) + Br!) (aq) + 6H'*aq)—» 38r,(aq)+ 3H,0() t Choose the correct expression tog Ae (2) A ie q SBC 3 Bel (1) 2 At 5 At atpro'> ; AL gq) SBrOM1 2 af6) at 3 at a(Ht 6a Br @) lH safer] at Sat tog [Al AIBr,] | 2a(H a) 2B i 3) (4) All are correct ®) it ‘at 100. time 95, Select the correct statement (1) Molecularity of the reaction can be zero or fractional (2) We always determine order of reaction from balanced chemical equation (3) The enthalpy of reaction remains constant in the presence of catalyst (4) All collisions of reactant molecules lead to product formation Consider the following statements regardi complex reaction |. A complex reaction proceeds through seve? steps. IL The molecularity of reaction is the sum molecularity of each step. II Order of a complex reaction is determined the fastest step in its mechanism. Choose the correct statement(s) (1) lal @ Nall (3) Only! (4) nail Office : Aakash Tower, 8, Pusa Road, New Delhi-110005 Ph.01 ara ast Loap for NEET (Part) 401. Consider the following graph Activated complex Product Time —> Choose the incorrect statement(s) (1) Reaction is exothermic in forward direction ie., AH=-ve (2) Activation energy for forward reaction is x — y (@) Using catalyst will decrease AH value of the reaction (4) Allof these 402. Which curve represents zero order reaction? z z we Qs 3 6 Lect aa z z @: \ (ots [eae 8 6 ot t 408. The threshold energy of a chemical reaction depends upon (1) Nature of reacting species (2) Temperature (8) Concentration of species (4) Number of collision per unit time or collision frequency 104. in a first order reaction 100 gm of reactant becomes 50 gm in 6.93 hrs, then what will be the Weight left after 23.03 hours? (1) 109 Q 29 ©) 30g @) 409 105, Time taken to reduce the concentration of a first Order reaction to 1/4" of initial concentration if half- Me is 30 minute (1) 30 minute (2) 60 minute ®) 120 minute ‘Aakash Education | ssaaSSsaESSeEIEE 106, 107. Chemical Kinetics 93 The unit of rate constant for 2" order reaction is (1) time (2) L mole-* (3) mole L? 5-1 (4) L mole? 5-2 For the reaction CH;OCH,(g) —» CH,(g) + H,(g) + CO(g) ‘The rate of reaction is given as R = K(CH,OCH, Ws in a closed vessel. If pressure of CH,OCH,(g} expressed in terms of bar and time in minute ‘nin, then the units of rate constant (k) should be (1) [bar]' [miny-* (2) bar}? [min]-* @) [bar fminy* [bar}-"2 [miny-* SECTION - B Assertion - Reason Type Questions In the following questions, a statement of assertion (A) is followed by a statement of reason (R) (1) If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1) (2) If both Assertion & Reason are true but the reason Is not the correct explanation of the assertion, then mark (2). (3) If Assertion is true statement but Reason is false, then mark (3). (4) If both Assertion and Reason are false statements, then mark (4), A: Product can form only when the required orientation and energy conditions of reactants are favourable. R: All collisions between reactants yield the desired product ‘A: For elementary reactions, the law of mass action and rate law expressions are generally same. R:: Molecularity of elementary reaction is always one. A: At very high temperature (approaches to infinity) rate constant becomes equal to collsion frequency. R:: The collisions in which molecules collide with proper orientation is called ineffective collisions. 1d, New Delhi-110005 Ph.011-47623456 94 Chemical Kinetics 4. A R: Order of reaction always depend on the : Base catalysed hydrolysis of ethyl acetate is a first order reversible reaction. stoichiometry of the reaction. aa a Last Leap for NEET (Part. : The overall order of the reaction is the sum of | power of all the reactants in the rate expression. : There are many higher order reactions. ea Oe reo co eco a Hy 4% % @) 56. 3 “ @ 45, 2) a ° (4) 41. (1) 42. (3) a x Bs we ee ee oe 3 @ 8 O BH oF So eo ae oO aoe crag) eae os 2 @ 7% @ 7% Ct eae n @ ae ates 10} 75. (1) 76. (3) 7. (4) n . Cb @2f) G@M aa a a ee oe) 88. (4) 90. (4) 1. @ BO HM) ww) a ae ae 101. @) 102. @) 102. @) a econ 8 ‘assertion-Reason Type Questions 1 eo 2 3 (1) 4 @) 5 @) _ a a @ Chapter - 7 : Solution secion A: Objective Type Questions a 1 @ 2 @) 3. 2) 4 (1) 5. @Q) 6 @ 7 (2) a @) 9 @ 10. @) cn) 2se() 13. (2) 14. (4) 15. (1) 16. (1) 17. (1) 18. (1) 19. (3) 20. (2) 21. (4) 2 () 23. (1) 24. (2) 25. (2) 26. (2) 27. (4) 28. (2) a @ 30. (1) 31. (2) 32. (4) 33. (2) 34. 3) 35. @) % 4) 37 (1) 38. 4) Ar of 4&4 2 @ 43 8) “4 2 45. (4) 46. (3) 47. (4) 48. (1) 49. (3) 50. (1) 51. (3) 62. (2) 53. (2) 54. (3) 55. (3) 56. (1) a. 4) 58. (4) 59. (4) 60. (2) 61. 4) 62. (2) 63. (2) 4 4) 65. (4) 66. (1) 67. (2) 68. (2) 69. (1) 70. (2) 1. @) 72. (3) 73. (3) 74. (3) 75. (2) 76. (3) 77. (A) 78. (3) 79. (1) 80. (2) Bt. (1) 82. (3) 83. (3) 84. (4) % @ 86. 3) 87. 3) 88. (1) 89. 3) 90. (4) a. 4) a rr O) 94. 2) 95. @) 96. (4) 97. @) 98. @) % @) 100. (2) 101. (4) 102. (4) 103. (3) 104. (1) “on B : Assertion-Reason Type Questions @ 2 (1) 3. (4) 4. @ 5. (4) 6 2 Chapter - 8 : Chemical Kinetics ‘son 4+ Objective Type Questions ,©) & © a © 4 @ & @ a) 7 @ _ ° x 3) 10. (4) 1. 2) 12, @) 13. @) 14, (1) a 16. (4) 17. @ 18. (3) 19, 2) 20. 8) 21. a) ) 23, (4) 24, (2) 25. (1) 26, (1) 27. 2) 28. (2) (iki essen sos Aakadh Tove) PUA ROed, NOW DetT0008 PhottTEaa4sB ) ~ c i 396 Answers Last Leap for NEET (Pay | 29. (2) 30. (3) 31. (1) 32. (4) 33. (3) 34, (4) 35. (2 | 38.) 37. @) 38. (1) 39. (3) 40. (1) “1. (2) 42 (1) | 43. (2) 44. (2) 45. (1) 46. (4) 47. (3) 48. (3) og | 50. (3) 51. (3) 52. (2) 53. (2) en) 55. (2) 58. | @. 58. (2) 59. (1) 60. (3) 61. (1) 62. (1) 6 @ | (1) 65. (4) 66. (2) 67. (4) 68. (2) 69. (4) 70. | 71. (4) 72. (3) 73. (3) 74. (2) a) 76. (4) 77. (A) 78. (2) 79. (2) 80. (4) 81. (2) 82. (4) 83. (3) 4% | | 85. (4) 86. (1) 87. (1) 88. (3) 89. (3) 90. (2) 91. 3) ( 92. (3) 93. (3) 94. (2) 95. (3) 96. (3) 97. (2) 98. (4) 99. (3) 100. (3) 101. (4) 102. (3) 103. (1) 104. (1) 105. (2) 106. (2) 107. (4) Section B : Assertion-Reason Type Questions 1.) 2 @) 3) 4 4) 5. (3)

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