Chapter 16 Solution 1 tf pe is 100% ionised then its van't Hoff factor will be OZ 4 (3) 6 (4) 3 Lowering of vapour pressure for 1m aqueous solution is 1.08 mm of Hg at 25°C. The vapour pressure of pure liquid at 25°C is 10x mm of Hg The valve of x will be, assuming very dilute solution (1) 4 (26 (3) 8 (4) 3 iil have negative value for a How many terms wi solution showing -ve deviation ? AG» ASyuns Hp BV ne (2 (2) 3 (4 41 ‘The above set up has been repeated four times with 4 different aqueous solution of same non-volatile solute with different concentrations. The loss in weight of solution in container is in order D > B > > A Arrange A, B, C, D in terms of concentration of solute (1) D>B>C>A (2)A>B>C>D (@) A>C>B>D (4) A>D>C>B ‘azeotropic mixture of water and C;H.OH bois sik. By distiling the mixture, it posse g obtain (1) Pure (2) Pure water only th water and C,H,OH in pure state C,H,OH only (3) Bot (4) Neither C,H,OH nor water Consider 0.1 M solution of two solutes X ang y Solute X dissociates in two ions whereas y ses in the solution. Which of the followin jg dimeri false 7 (X and Y represents solution containing x and Y respectively) (1) (AT Je? (AT) 2) (BP), >(8), (3) (FP), > (FP), (4) (4T,), >(4T), ‘An ideal solution was found to have a vapour pressure of 80 torr when the mole fraction of na volatile solute is 0.2. Find vapour pressure of pus solvent at same temperature (1) 64 torr (2) 72 tor (3) 80 torr The freezing point of a 4% (wiv) aqueous soluion a ‘BW is equal to the freezing point of 10% (wiv) aqueous solution of ’B'. The molecular weight ot A is 60, find out the molecular weight of B. Assume both A and B are non electrolyte and (4) 100 torr molarity = molality (1) 150 (3) 45 When mercuric iodide is added to th solution of KI, then the : (1) Freezing point is raised (2) Freezing point is lowered (3) Freezing point does not change (4) Boiling point does not change New Deti-110005 pn ot 7624 (2) 90 (4) 180 e aqueadsfor NEET law constant of Henry in Re or Nc mt of Np Over water surfane' “Ater when, 10 Presi e re temperature remains, Constan). § atm (cons) ie? () 010 fae as (4) ong VpOUPESSUTE of & Solver, De im of Hp. When a NOn-Volatile, nev 280d by 10 Bee te Mate tecter n ecto seen 02 Find out male lus Haerese Un op0ur pessry gon the soe 9 a ®@ oz ae 4) 03 The pair of solutions which sho. © rondts law Is © deviation trom (1) CCl, + cHoI, a Br 2) Eo + oe @) H,0 + HNO, ° H «) Peach cs, 13, Two solutions of glucose hay atm and 2.5 atm respectiv is mixed with 2 lit. of ve Osmotic pressure 1.5 ely. 1 lit of first solution solution will be : (1) 2.16 atm 2) 3.5 atm @) 5.12 atm (4) 7.2 atm %4- Which one of the following solution has highest boling point ? (considering Molality = Molarity) (1) 0.2 (M) Aqueous NaC! solution (2) 0.5 (M) Aqueous Glucose solution (3) 0.3 (M) Aqueous CaCl, solution (4) 0.2 (M) Aqueous urea solution 1S. What is AT, for 0.2 molal aqueous solution of urea? {K, of H,0 = 0.52) (2) 101.04 K kK (4) 5.06 K 16. 17. 18, 19 20. 21. Solution | 3419) The value of van'. Hott Tonised ie PM factor for KyFe(CN)g. i is 5 4 @ 18 44 Sugar sdlution Water is water 12°.1M0 beakers are inside ajar a8 shown ‘and kept {or a long duration, Then (1) Mass of Sugar solution will increase (2) Mass of ‘Sugar solution will decrease {9) Mass of H,0 in the right hand beaker will increase (4) No change in mass of either beaker Relative lowering of vapour Solution in which mole tract a4 Dressure produced in a ion of solvent is 0.7 is 207 @) 03 (4) 05 Which of the folowing physical quantity isnot zero for an ideal solution? 1) OH peng 2) ASaiving @) AV ening (4) All of these Which one of the followin point azeotrope 7 (1) CHCl, + ¢,H,0H (2) Ethanol + water 19 form maximum boiling (3) Benzene + toluene (4) HCI + water Relative lowering in vapour pressure of a solution Containing 1 mole K,S0, in 549 H,0 is (K,S0, is 100% ionised) ei 1 3 gs @ 5 3 a OG 3 Pour,320 22. Solution In the following graph, vay . vapour pressure is potled against mole fraction of the components, Which of the following statement is correct ? ak or s.| ER Tate 5, (Mole traction of B) (1) AD represents var liquid A with xg In of vapour pressure of (2) BC represents variation of vapour pressure of liquid B with x, (3) GH + FH = EH (4) All of these 23. Henry's law constant for ©, and Nz are Ko, = 3.3 * 107, Ky, = 6.6 = 107 x Calculate ratio of <>, a ‘of ©, and Nz dissolved in water at 25°C assuming that air contains 80% Np and 20% O, by volume (1) 0.62 2) 092 (3) 0.42 (4) 0.5 24. The solubility of which of the following substances will decrease with increase of temperature ? (1) Calcite (2) Na,CO3 (3) Na,SO, (4) All of these 25. Which of the following will not show positive deviation ? (1) Ethy! alcohol and cyclohexane (2) CCl, and CHCl, (8) mbutane and n-pentane (4) CHCOCH, and aniline 26. For which of the solvent K; has the highest value ? (1) Benzene (CeHg) (2) Water (H,0) 3) CCl, (4) Camphor (C19H;60) e, the ratio of mole fraction 27. 28. 29, 31. a Catalyst Packa Nee Which of the following statements isiar the above graph ? (1) BC shows variation of vapour press solvent with temperature © Correct fy Te OF ary (2) D represent freezing point of solution (3) AB corresponds to the vapour pressur at different temperature (4) All of these © Of soy Vapour pressure of a pure solvent is 200mm 4 2 mole of a non volatile solute is mixed in @ put of solvent, the relative lowering of vapour pressue will be (1) 02 @) 06 The solubility of a specific non volatile salt is high at 25°C. If 2gm, 4gm and 6gm of the salt added fp 100gm at 25°C, the vapour pressure xyz (respectively) will follow the order of (1) %Y=z @) 2Yox Henry law constant for N, in water at 25°C is 2x105 atm. Mass of N, in 500mL water at tatm pressure at 25°C is: (1) 2.4x10-%9 (8) 1.4*104g Which of the following aqueous solution has highest boiling point? (1) 0.02 M NaCl (3) 0.005 M CaCl, ‘A complex is represented as CoCl,.xNH,, Its 0.1 molar solution in water shows melting point ~ 0.558K. (K, of H,O=1.86 K molality"). Assuming 100% ionization of complex and coordination number of Co is 6, formula of complex is (1) [Co(NH,),Cict, (2) [Co(NH,),)c1, (9) [Co(NH,),ciJc1 (4) All of these (2) 04 (4) 08 (2) x>Yoz (4) X= =2 (2) 1.4*10%g (4) 3.9x10% (2) 0.05 M sucrose (4) 0.02 M Cac, |[Kakash Educational Services Limited - Regd, Office : Aakash Tower, 8, Pusa Road, New Delhi-110005 Ph.0tt-47623456, —- ps for NEET highest osmotic * 8 positive deviation solution, enthalpy change For is (seo @) aH>0 @ sH#<0 (4) All of these amount of ice that will separate out on cooling a solution containing 50 g ethelene glycol in 200 gm wwater to — 9.3°C will be (K, water = 1.86 K kg mol!) (1) 3879 (2) 3879 @) 8379 (4) 8.379 ne temperature at which 10% aqueous solution (W/ \p of glucose will exhibit the osmotic pressure of 46.4 atm is [R = 0.082 dm? atm K-" mol") (1) 360 K (2) 180k @ 90K (4) 300 K Find the amount of urea that should be dissolved in 100g of water in order to reduce its vapour pressure by 25% (1) 83.33¢ @) 11.119 @ 18519 (4) 459 ‘At 40°C, the vapour pressure of pure liquids, benzene and toluene are 160 mm Hg and 60 mm Hg respectively. At the same temperature, the vapour pressure of an equimolar solution of two. liquids, assuming the ideal solution should be (1) 140 mm Hg (2) 110 mm Hg (3) 220 mm Hg (4) 100 mm Hg K,, for H, (g) / water system is 5.34%107 torr. If the partial pressure of H, over a solution at 25°C is 760 torr, then determine the solubility of hydrogen. Assume density of HO and solutions are same (1) 64 = 10° mol L* (2) 7.89 x 104 mol L* (3) 5.9 * 10° mol L-* (4) 89 = 10+ mol L” ‘An aqueous solution of glucose boils at 100.01°C. Molal elevation constant of water is 05 K molality’. Find number of moles of glucose in 100g water (1) 1*10? mole (2) 1x10? mole 40. a 42, 43 45, 1ct from the following that hé pressure (1) 0.1. N urea @) 0.1 N Na,SO, (2) 0.1. N NaCl (4) 0.1 N Na,PO. ile, non- For a solution containing non-volatile, | 7 Clectrolytic solute the relative lowering in ape a pressure is 02. If total number of moles promot the solution is 5. then which of the fol correct ? (1) Mol fraction of solvent, Xsoivent = 08 =08 (2) Mol fraction of solute, Xone (3) Number of moles of solute = 4 (4) Number of moles of solvent = 2 Two pure liquids A and B have vapour pressures in the ratio 1; 3. The mol fraction of ‘A’ in vapour phase, when A and B are mixed in 1: 3 molar ratio in a solution, will be () 0.4 (2) 0.2 3) 0.3 (4) 05 Consider the following graph, depicting the variation sure of of total vapour pressure and vapour pres: components of a solution with mol fraction. % % (mol fraction) Which of the following is correct regarding the plot? (1) Ais more volatile than B (2) B will be more in liquid phase starting from ‘equal mole fractions of ‘A’ and ‘B’ (3) AD= BD +CD (4) AD = BC + CD A gas exerts a partial pressure of 0.2 atm over water. The Henrys’ law constant is 104 atm. The solubility of the gas in millimol per litre will be approximately (1) 2.75 x 10-5 (2) 1.1 = 10-3 (3) 1.1 * 10-8 (4) 2.75 x 104 If a saturated solution of potassium nitrate is heated (1) It becomes unsaturated (2) It becomes super saturated (3) It remains saturated (4) Crystallization occurs7 EE ———— 7 : 322 Solution t Package for Neey }: 46 If an ideal solution is Produced by mixing components A and B, then which of the following is correct? (1) AGyy = (2) BHyyy = 0 @) AG pie = 0, Spy = 0 (4) AS = 0 47. Far which of the folowing binary mates, (1) CoHgCl + C)H.Br (2) CH.OH + CH;-CO-CH, (3) H,0 + HNO, (4) CHC, + CH, ~ CO - CH, 48. For a mixture of HCI and water, the following statements are written (@) The solution exhibits negative deviation from Raoult's law (b) The solution boils at a temperature higher than those of either components (c) The solution is an example of maximum boi azeotrope The correct statement(s) is/are (1) (@) and (b) (2) (©) only (3) (@) and (c) (4) (@), (b) and (c) 49. The ebullioscopic constant for a solvent is 0.5 K molal-'. The boiling point of a solution containing 0.05 mole of 2 non-volatile, non-electrolytic solute in 0.25 kg solvent will increase by (1) 10K @1K @) 01K (4) 100 K ‘Which of the following solutions will have highest (2) 0.1 M BaCl, (4) 0.1 M Fe,(SO,), cease of osmosis, solvent moves from }) Higher vapour pressure region to lower vapour pressure region 2) Higher concentration to lower concentration Lower vapour pressure region to higher vapour pressure region ‘osmotic pressure region to lower osmotic region 52. 53, 55, 57. 58, 1 pressure of a solution of a non. Toate B in solvent A mixed in 2 : 5 molar rage $0 mm. Considering idealty, calculate tho vag” sressure of a solulion prepared by mixing B ang, in the ratio 3: 4 (1) 200 mm of Ha (@) 150 mm of Ho ‘An equimolar solution of two volatile liquids A qy . Ngo mor) and B(M = 200 9 mol) has vary pressure £00 tort. f vapour pressure of pure By B00 tort the mol fraction of component A in vape.s phase is (1) 05 2) 06 @) 03 (4) 04 Which of the following is true with respect tg Henry's law ? (1) With increase in pressure of the gas, its solubility increases (2) It is obeyed by gases at low temperature ang high pressure (2) 300 mm of Hy (4) 375 mm of Hg (3) With increase in temperature the value of Henrys’ law constant decreases (4) All of these For a solution with negative deviations which of the following is true ? (1) BGpig <0, AS yyy > 0 (2) AHpig < 0, AViniy <0 (8) AGpiy <0, Spe < 0 (4) Both (1) and (2) Which of the following binary solutions exhibits negative deviations from Raoult law ? (1) Acetone + Ethanol (2) Pyridine (8) Acetone + Carbon disulphide (4) Cyclohexane + Ethanol BLP. of Azeotropic mixture of HNO, and H,0 is. (if BP of HNOs is x and B.P of H,0 is y) (1) Greater than y @ *> (3) Less than x (4) “a An element 'X’ exists as a polymer X,, When 32 9 of X is dissolved in 200 g of a solvent (K; = 5K molal-*), the freezing point is lowered by 0.125°C: ‘The molecular formula of X,, is (Atomic wt of X = 80) 1) & (2) %& O% 4) % Limited - Regd. Office : Aakash Tower, 8, Pusa Road, New Delhi-110005 Ph.011-47623455a @ 15 Which one is/are correct 7 (4) 210 Statement |; Molar mass of determined by osmotic pressure Mathog Statement Il Mixture of c positive deviation solution Cl, + Toluene is tM: During formation of deviation solution heat is abs positive ‘statement IV ; Upon addition of | solution. B.P increases (1) LM IV only @ nm @) 1.1, Ml only (4) 1.0, mv Which of the following will have the same value of Van't Hoff factor as that of K,IFe(CN).]? (Assume equal degree of dissociation) (1) NaySO, (2) ANO,), @) Ala(SOz)3, (4) K3IFe(Cn),) Calculate the Van't Hoff factor (i) of k, (Fe(CN),] which is 80% ionised A () 14 (2) 28 @) 32 (4) 42 Which of the following is not associated with ideal solution? (1) BH, = 0 @) A8q4,= 0 ©) Vp = 0 4) AG, < 0 IP, is osmotic pressure of 0.1 M KCI and P, is osmotic pressure of 0.1 M acetic acid then (1) P,>P, (2) P,> P, BP, (a) Py The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q is 72 torr. The pure vapour pressure of liquid P is 80 torr. The pure vapour pressure of liquid Q is (1) 80 torr (2) 60 torr (3) 40 torr (4) 20 torr l(s) in ageous Ki Ee 69, 70. rT 72. Which has minimum freezing point? aya Q1 Solution 323 Which of the following is correct? (1) The solubility of a gas in water increases with increase of temperature (2) The solubilty of a gas in water increases with increas of pressure (3) Higher the value of K,, at a particular pressure, higher is the solubility of the gas in the liquid (4) Henry's law is valid if the gas reacts chemically with the solvent and dissociates or associates in the solvent 5 mol of solvent along with 2 mol of a non-volatile solute exhibit vapour pressure = 250 mm jig. If we make a mixture containing 4 mol of the same solvent and 3 mol of the same solute, then what would be vapour pressure now? (1) 300 mm jig (2) 200 mm ug 3) 225 mm yg (4) 275 mm 1g The following plot best represents 1 solubility Temperature —> (1) Nac (2) Nano, @) Na,SO,.10H,0 (4) Cac, Which of the following combinations is correct for a binary solution 2 (1) GgHg and CgHeCH, ; AgyH > 0; A.V = 0 9 I @ cH,-E-cH, ana CHCly ; AygH <0; A,yV <0 (8) H,0 and HCI ; AH > 0; AV <0 (4) H,0 and CH,OH ; AsgH <0; A,,V <0 The depression in freezing point of 0.01m aqueous CH;COOH solution is 0.02046". 1m urea solution freezes at -1.86°C. Assuming molality equal to molarity, pH of CH,COOH solution is (2 (2) 3 (@) 32 (4) 42 Choose the correct statement (1) Calcium acetate shows decrease in solubility with rise in temperature (2) Solubility of KNO,, NaNO, decreases with rise in temperature (8) Solubility of gases increases with increase in temperature Vapour pressure depends on volume of the el in which liquid - vapour equilibrium is | _-324° solution 73, An aqueous solution freezes at ~0.186" = 1.86 Kkgmol-', Kkgmo elevation of boiling (1) 0.186 (2) 0512 0.512 (kK, Ky = 0.512Kkgmol~'). The Point of the solution is (in K) @) 1.86 (4) 0.0512 Osmotic pressure of a sucrose solution is 4.926 ‘atm at 27°C. Which of the following is not isotonic with the given solution 2 (1) 3.6% glucose solution (2) 1.2% urea solution (3) 0.585% NaC! solution (4) 1.7% NaNO, solution 74, 75, A B o1M o1M Cu" (aq.) NH; (aq.) ‘SPM. In which of the following compartment, Blue colour of [Cu(NH,),]* will be observed first ? (1) A compartment (2) B compartment (3) Blue colour will be observed at same time in both compartment (4) None of these compartment shows blue colour | 2 Which of the following point represents Azeotropic Mixture concentration ? (A 28 @c 4). Catalyst Package for Ney 7. nA=A, it «Is the degree of association, what wil be iy, value of van't Hoff factor (i) ? () 14 0-e 21 a ct 4) 1-0 @ t-a+5 (4) 1-0 78, What will be the osmotic pressure of 0.2 MX (ag solution at 300K ? [K,(HX) = 8 * 10-5] (1) 3.926 atm (2) 5.024 atm (3) 7.124 atm (4) 1.813 atm 79. According to Henry's law, the solubility of a gas iq 2 given volume of liquid increasing with increase in (1) Temperature (2) Pressure (3) Henry Constant (K,,) (4) Both (1) and (2) 80. Which of the following property will have the same sign of value for ideal solution and solution showing the deviation ? [K,(H,O) = 0.52 K kg mol") (1) AG yas AHpcs ASpq (2) AV ye AS, 8) AS yu» AGoi (4) AV, AG, 81. 0.1 Molal aqueous solution of an electroyte AB, is 20% ionized. The boiling point of solution at 1 atm is [K,(H,0) = 0.52K.kg.mol"] (1) 273.19K (2) 274.92k (3) 374.92K (4) 373.19k 82. 24,9 of C,0,H, is dissolved in 100 g water, in order to produce ice, mixture is cooled to -10°C, if K, = 1.86, the amount of ice (in g) separated (1) 25.6 2) 50.5 (@) 756 (4) 208 83, The total vapour pressure of a solution of methancl and ethanol in an ideal solution is given by P= 135a + 100 (where & = mole fraction of methanol). Pure state vapour pressure of methanol is (1) 235 mm ug (3) 35 mm pg (2) 100 mm yg (4) 135 mm yg 84. Henry's constant for Ar is 40 kbar in water. Then ‘molal concentration of Ar in water kept at 10 a" pressure will be (1) 0.09 @) 0.05 (3) 1.25 (4) 0.014 | Services Limited - Regd. Office : Aakash Tower, 8, Pusa Road, New Delhi-110005 Ph.011-476234568. Package for NEET ‘A mixture of benzer pressure of 290 mm of Hg at 300K. The vapour pressure of toluene is 200 mm of Hg. If the mole fraction of benzene is 0.6 then its vapour pressure in pure form at same temperature will be (1), 700 mm of Hg @) 300 mm of Hg (@) 350 mm of Hg (@) 200 mm of Hg Which one pair of compounds will exhibit +ve deviation from Raoult's law 2 (1) H,0 + HNO, (2) (CH,),CO + CHC! {) C,H,OH + H,0 (4) CH,COOH + C.H.N (Pyridine Solution 325 nd toluene have a vapour | 87. Elevation of boiling point was found to be 0.52°C. When 8g. of a compound (Nonvolatile, Nonelectrolyte) was dissolved in 200g of water then molar mass of the compound will be : [Given K,(H,0) : 0.52 Kkg mol} (1) 50 (2) 100 (3) 40 (4) 30 88. Which of the following aqueous solution is having highest freezing point ? (Assume : Molarty = Molality] (1) 0.01 (M) KCI (2) 0.005 (M) CaCl, (3) 0.01 (M) Na,SO, (4) 0.005 (M) Glucose Q