1 Mark Questions Multiple Choice Questions 4. van’t Hoff factor for Na gSO , -10H20 solution, assuming complete ionisation is case 2024 @l (3 13 @2 2. van't Hoff factor for KCI solution assuming the complete dissociation is ‘case 2024 @t (b)2 (05 @1s 3, van't Hoff factor forKzSO 4 solution, assuming complete ionisation is, case 2024 @t 3 © @2 4, Isotonic solutions have the same case 2024 (a) density (©) refractive index (©) osmotic pressure (@ volume 5, A compound CaCl, -6H;0 undergoes complete dissociation in water. The van't Hoff factor “i” is @9 ws esse 2023 ©3 @4 6. A compound undergoes complete dimerisation in a given organic solvent. The van't Hoff factor ‘is (2.0 (b)0.5 (CBSE 2023 (0.25 (@10 7. A compound undergoes complete tetramerization in a given organic solvent. The vant’t Hoff factor is @40 (b) 0.25 case 2023 (0.125 (2.0 8. Which of the following aqueous solution will have ighest boiling point ? (@ LOMKCI (©20MKCI 9, Out of the following 1.0 M aqueous solution, which one will show largest freezing point depression ? (@) NaCl (b) NaySO, case 2023 (0) CoH i20e (@)Alz(804)s 10, If molality of a dilute solution is doubled, the value of the molal elevation constant (K,,) will be CBSE 2023 (a) halved (b) doubled (©) tripled (@) unchanged (&) 1L0MK,SO, (@)2.0MK,S0, CBSE 2023. 44, How much ethyl alcohol must be added to 1 litre of ‘water so that the solution will freeze at — 14°C? case Sar 2023 (Ky for water = 1.86°C/mol) (7.5 mot (b) 8.5 mol (©) 9.5 mol ( 10.5 mol 42. In which of the following cases blood cells will shrink? BSE SQP 2021-22 (Term-!) (a) When placed in water containing more than 0.9% (mass/volume) NaCl solution. (b)When placed in water containing less than 0.9% (mass /volume) NaC! solution. (©) When placed in water containing 0.9% (mass/volume) ‘NaCI solution. (@ When placed in distilled water. 43, Water retention or puffiness due to high salt intake ‘occurs due to ‘CBSE SQP 2021-22 (Term-!) (@) diffusion (b) vapour pressure difference (©) osmosis. @ reverse osmosis 14, The freezing point of a 0.2 molal solution of a non-electrolyte in water is (K', for water = 1.86 K kg, mol”') (CBSE 2021-22 (Term-1) (@-0.372°C (b) = 1.86°C (©) +0372°C (@) + 1.86°C 45. The osmotic pressure of a solution increases, if (CBSE 2021-22 (Term-) (a) the volume of the solution is increased (b) the number of solute molecules is increased (©) temperature is decreased (@) solution constant (R) is increased Assertion-Reason Directions (Q. Nos. 16-20) In the following questions an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer. (a) Both (A) and (R) are correct and (R) is the correct, ‘explanation of (A). (b) Both (A) and (R) are correct but (R) is not the correct explanation of (A). (©) (A) is correct and (R) is incorrect. (@ (A) is incorrect and (R) is correct. 46. Assertion (A) When glucose is added to water, an ‘elevation in boiling point is observed. case 2023 Reason (R) The lowering of vapour pressure causes elevation in the boiling point.16 Chopterwise CBSE Question Bonk : CHEMISTRY 7. 18. 19. 20. Assertion (A) When NeClis added to water, a n freezing point is observed. CBSE 2023 depressic Reason (R) The lowering of vapour pressure of solution ceuses depression in the freezing point. Assertion (A) Osmotic pressure Reason (R) Osmotic pressure is proportional to molality. Assertion (A) Crvoscopic constant depends on nature of solvent, (CBSE SQP 2021-22 (Term-t) cese 2023 Reason (R) Cryoscopic constant isa universal constant. Assertion (A) Molarity of @ solution changes with empereture, Reason (R) Molarity is a colligative property. (CBSE SOP 2021-22 (Term-t) Very Short Questions 21. 22. 23. 24. 25. Predict whether van't Hoff factor will be less or greater than one, when ethanoic acid is dissolved in zene. CBSE 2024 All india 2014, 12 ‘What ere isotonic solutions? Define the term osmotic pressure. All India 2013; Dethi 2010€ ‘What is meant by reverse osmosis? All india 2013, 2011 Explain boiling point elevation constant for a solvent or ebullioscopie constant. All India 2012 ; Foreign 2012 2 Marks Questions 26. 27. 22, 29. 14 g of a non-volatile solute is dissolved in 200 g of H,0 freezes at 272.07 K. Calculate the molecular mass of solute (Ky for water= 1.86K kg mol”) Cgce 2024 A solution containing 60 g of a non-volatile solute i 250 g of water freezes at 270.67 K. Calculate the molar mass of the solute. (Ky of water = 1.86 K kg mol7'), case 2024 Calculate the mass of CaCl, (Molar mass = 111 g mol~') to be dissolved in 500 g of water to lower its freezing point by 2K, assuming that CaCl, undergoes complete dissociation, (K, for water 86 K kg mol~') ‘CBSE 2024 Caleulate the molar mass of a compound when 6.3 g of itis dissolved in 27 g of chloroform to form a solution that has a boiling point of 68.04 °C. The boiling point of pure chloroform is 61.04 °C ang K, for chloroform is 3.63 °C kg mol ion of Na ,SO, -10H,0 (molecular weight isotonic with 2% solution of non-electrolytic, non-volatile substance X. Find out the molecular weight of X. CBSE SOP 2024 31. A glucose solution which boils at 101.04°C at 1 atm, What will be of relative lowering of vapour pressure an aqueous solution of urea which is equimolal to given glucose solution? (CBSE SaP 2021 (Given: K, for water is 0.52 K kg mol) What happens when, (a pressure greater than osmotic pressure is applied on the solution side separated from solvent by a semipermeable membrane? Gil acetone is added to pure ethanol? All india 2070 32. 33. Calculate the freezing point of a solution containing 8.1 g of HBr in 100 g of water, assuming the acid to ‘be 90% ionised. (Given: Molar mass of Br = 80 g/mol, K, for water = 1.86K kg/mol] case sap 2019 34. Which of the following solutions has higher freezing point? (CBSE SaP 2018 0.05 M Al, (SO,)5, 0.1 MK, [Fe(CN)¢} Justify. Calculate the freezing point of a solution containing 60 g of glucose (molar mass = 180 g mol~') in 250 g of water. (Ky of water = 1.86 K kg mol) pj 2018 35. 36. Give reasons for the following. (@ Measurement of osmotic pressure method is referred for the determination of molar masses of macromolecules such as proteins and polymers (Gi) Elevation of boiling point of 1 M KCI solution is nearly double than that of 1 M sugar solution. Delhi 2018 37. Define the following terms. () Colligative properties 38. Define the following terms. (Abnormal molar mass (Gi) van’t Hoff factor (ii) Molality (m)Dethi 2017 Delhi 2017Solutions ‘ 39, Define osmotic pressure of a notation, How is the osmotic pressure related (0 the concentiation af a solute in a olution’? Dathi 20156 40. (i) On mixing tiquid Vand fiquid ¥, volume of the resulting solution decreases, What type of deviation from Raoutt’s law is shown by the resulting solution?’ What change in temperature would you observe after mixing liquids Nand 7 (ii) Wh happens when we place the blood cell in (hypertonic solution 41, Why does a solution containing non-vo have higher boiling point than the pun is elevation of boiling point a col tile solute solvent? Why igative property? ‘All india 2015 42, Calculate the mass of compound (molar mass = 256 g mol!) to be dissolved in 75 g of benzene to lower its freering point by 048 K(K, =512 Kkg mol”). ‘All India 2014 solvent affected whi Delhi 2014¢. 43. How is the vapour pressure of a non-volatile solute is dissolved in i? 44, An aqueous solution of sodium chloride freezes below 273 K. Explain the lowering in fre of water with the help of a suitable diagram, Delhi 2013¢ 45, 18 p glucose, Cy1),0q (molar mass = 180 gmol"!) is dissolved in | kg, of water in a sauce pan, AC what temperature, will this solution boil? (K,, for water = 052 K kg mol ‘boiling point of pure water =37315 K). Dethi 2013 & CEaUIDEA «Firs, find out AT, by using formula, 1, = Koni #1000 Te My xe | 6 then, find out the value off, by using formula, | ATy=Ty-To° 2 46. A 1,00 molal aqueous solution of trichloroacetic acid (CC1,COON) is heated to its boiling point. The solution has the boiling point 100. 18°C. Determine the van't Hoff factor for trichloroacetic acid, (K, for water = 0.512 K kg inal ) Delhi 2012 47. Define the following terms. (i) Isotonic solutions ) van't Hoff factor eth 2012; All India 2012 17 AB, Define the terms. Osmosis and osmotic pressure. Is the osmotic pressure af a solution a colligative property? Pxplain, Delhi 2011 9, What is van't Hoff factor? What possible values can it have if the solute molecules undergo dissociation’? Dethi 20116 50, ‘The molecular masses of polymers are deterinined by osmotic pressure method and not by measuring, other colligative properties. Give two reasons. ‘All Indio. 20116 51, Define the terms osmosis and osmotic pressure. What is the advantage of using osmotic pressure as compared to other colligative properties for the determination of molar masses of solutes in solutions? Ail india 2010 ind the boiling point ofa solution containing 0.520 g of glucose (C411 0g) dissolved in 80.2 g of water. [Given : K,, for water = 0.52 Km"']. alt india 2010 52. ind the freezing point of a solution containing 0,520 g glucose (C,H1,,04) dissolved in 80.2 g of water. [Given : Ky for water = 1.86 Km™'] All India 2010 53. 54, Outer hard shells of two eggs are removed. One of the egg is placed in pure water and the other is placed in saturated solution of sodium chloride. What will be observed and why? Ail India 20106 3 Marks Questions 55. (i) Boiling point of water at 750 mm Hg pressure is 99,68°C. How much sucrose (Molar mass = 342 gmol”') is to be added to 00 g of water such that it boils at 100°C ? (K, for water = 0.52 K ky mol”), (ii) State Henry's lawand write its any one application. ‘case 2024 56. Ishan's automobile radiator is filled with 1,0 kg of water. How many grams of ethylene glycol (Molar mass = 62 g mol ~') must Ishan add to get the freezing point of the solution lowered to —2.8°C. K , for water is 1.86 K kg mol case 2024 57. When 19.5 g of F—CH; —COOH (molar mass 78 w/mol) is dissolved in $00 g of water, thein freezing point i xd to be 1°C. depression in freezing point is observes Calculate the degree of dissociation of F—CH,COOH. 86K Kgmol') ese 2023 (Given : K,, for water = 58, If benzoic acid (M =122.g mol”') is associated into a dimer when dissolved in benzene and the osmotic pressure of a solution of 6.1 g of benzoic acid i 100 mL benzene is 6.5 atm at 27°C, then what is the percentage association of benzoic acid? CBSE 2023 (Given : R =00821 L atm K~' mol") ‘59, 0.3 mL of acetic acid (M = 60 g mol”) dissolved in 30 ‘g of benzene shows a depression in freezing point ‘equal to 0.45°C. Calculate the percentage association of acid if it forms a dimer in the solution. CBSE 2023 (Given : K, for benzene = 5.12 K kg mol~') 60, The freezing point of benzene decreases by 2.12 K when 2.5 g of benzoic acid CgH ;COOH is dissolved in 25 g of benzene. If benzoic acid forms a dimer in benzene, calculate the van't Hoff factor and the percentage association of benzoic acid. (Given :K , for benzene =5.12 K kg mol~') CBSE SOP 2021 61. Calculate the freezing point of a solution containing 0.5 g KCI(Molar mass = 74.5 g/mol) dissolved in 100 g water, assuming KCI to be 92% ionised. .86 K kg/mol) cBse sap 2020 62, A0.01 m aqueous solution of AICI; freezes at ~0.068°C, Calculate the percentage of dissociation, (Given : K,, for water =186K kg mol”) gin; 2020 Given: K,, of water= 63. The freezing point of a solution containing 5g of benzoic acid (M =122.g mol') in 35g of benzene is depressed by 2.94 K. What is the percentage of * association? (Given : K for benzene = 49K kg mol™') gu india 2020 64, Give reasons for the following. Case SaP 2019 (® When 2g of benzoic acid is dissolved in 25 g of benzene, the experimentally determined molar mass is always greater than the true value, (ii) Mixture of ethanol and acetone shows positive deviation from Raoult’s law. (ii) The preservation of fruits by adding concentrated sugar solution protects then against bacterial action. 65. 66. 67. 68. 69. 70. Chapterwise CBSE Question Bank : CHEMISTp, At 300 K, 30 g of glucose present in a lite ofits solution has an osmotic pressure of 4.98 bat. I the osmotic pressure of a glucose solution is 1.52 ba the same temperature, what would be its * concentration? All nia 20 9 A 4% solution (W/W) of sucrose (M =342 g mol“) , water has a freezing point of 271.15 K. Caleulate the freezing point of 5% glucose (M =180 g mot!) in water. Given : Freezing point of pure water 7315 K) Delhi 219 Calculate the freezing point of an aqueous solution containing 10.5 g of magnesium bromide in 200 of water, assuming complete dissociation of magnesium bromide. (Molar mass of magnesium bromide = 184 mol™', K; for water = 1.86 K kg mol “ty CBSE 2018¢ ‘A 10% solution (by mass) of sucrose in water has. freezing point of 269.15 K. Calculate the freezing point of 10% glucose in water, if freezing point of pure water is 273.15 K. (Given : Molar mass of sucrose = 342g mol” ' and molar mass of glucose = 180 g mol” ') Dethi 2017 GCSE | First, calculate the value of molality (of sucrose, using | Meta 1000 | m= Maze “Wart | then, calculate the cryoscopic constant(K,)by using | depression in freezing point, AT; = Kym Finally | calculate the 47; of glucose solution followed by | freezing point of glucose solution T; =273.15- AT. Calculate the boiling point of solution when 4 g of ‘MgSO, (M =120g mol™') dissolved in 100 g of water assuming MgSO, undergoes complete ionisation. (K, for water =0.52 K kg mol~') All India 2018 Calculate the mass of NaCl (molar mass = 58.5 g mol”) to be dissolved in 37.2 g of water to lower the freezing point by 2°C, assuming that ‘NaCl undergoes complete dissociation. (K , for water 1,86 Kkg mol! ) Foreign 2015 ‘What mass of NaCI must be dissolved in 65.0 g of water to lower the freezing point of water by 7.50°C? The freezing point depression constant (K‘,) for water is 1.86°C/m.Solutions Assume van't Hoff factor for NaCl is 1.87. (Molar mass of NaCl = 58,5 g mol). YGSUIDEA (0) Apply the formula, a7, = Kt W210 ang find, MW (0 See actandtarestongeecohies | | and j=2 (if not given in question) | 71. 45 g of ethylene glycol (CH,O; ) is mixed with 600 g of water. Calculate (@ the freezing point depression and (i) the freezing point of the solution (Given, Ky of water=1.86K kg mol") py 2015¢ 72. A 5% solution (by mass) of cane sugar (molecular weight = 342 g mol“') is isotonic with 0.877% solution of substance X’. Find the molecular weight of X. ‘All India 2015 73. 3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van’t Hoff factor and predict the nature of solute (associated or dissociated). (Given : Molar mass of benzoic aci for benzene = 4.9 K kg mol') 74. A solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm of Hg at 308 K. Calculate the molar mass of the solute. (Vapour pressure of pure water at 308 K =32 mm Hg) All India 2015 22 gol"! Ky Dethi 2015, Calculate the boiling point elevation for a solution prepared by adding 10 g of CaCl, to 200 g of water. (K, for water =0512 K kg mol”, molar mass of CaCl, =111g mol”). 75. Foreign 2014 76. Some ethylene glycol, HOCH,CH,OH, is added to your car’s cooling system alongwith 5 kg of water. If the freezing point of water-glycol solution is ~150°C, what is the boiling point of the solution? (Ky =052 Kkg mol” and K =186K kg mol”! for water) Dethi 2014¢ & (SSIIDEA (0 First, find out m by using, AT; = Kym. | iy Then, find out AT, by using, AT, = Kym. | iy Then find out the value off by using formula T=ATe+T8 77. Determine the osmotic pressure of a solution prepared by dissolving 2.5 10° g of KzSOq in 2L of water at 25°C, assuming that it is completely dissociated. (R =0821 L atm K™ mol!, molar mass of K SO, = 174g mol"). Dethi 2013 78. 1.00 g of anon-electrolyte solute when dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. Find the molar mass of the solute. (K; for benzene =512 K kg mol!) ‘All india 2013 79. A 5% solution (by mass) of cane sugar in water has freezing point of 271 K. Calculate the freezing point ‘of 5% solution (by mass) of glucose in water if the freezing point of pure water is 273.15 K. [Molecular mass of glucose (CgH,,0,) =180 amu or g mol"! and ‘cane sugat (C}yHy,0);) = 342 amu or g mol") ‘All Indio 2013 @IGaUDEA Freeting point of pure water is 273.15 K (0°O and that of jen solution 1271 K. Le we have depression in freezing point So, «apply the formula of epressonin freezing pointforcane Sugar andfind the valve of. + sethisyalueof, tofind out the value of 37, for lucose solution. Then find the freezing point of solution 80. At 25°C, the saturated vapour pressure of water is 3.165 kPa (23.75 mm Hg). Find the saturated vapour pressure of a 5% aqueous solution of urea (carbamide) at the same temperature, (Molar mass of urea = 60.05 gol"). Foreign 2012 81. 15.0 g of unknown molecular material is dissolved in 450 g of water. The resulting solution freezes at —0.34°C. What is the molar mass of the material? (Kp for water = 1.86 K kg mol"). gy indie 2012, 2010 82. A solution of glycerol (C3HO3) in water was prepared by dissolving some glycerol in 500 g of ‘water. This solution has a boiling point of 100.42°C, ‘what mass of glycerol was dissolved to make this solution? (K‘, for water = 0.512 K kg mol"). All India 2012; Delhi 2012, 2010 83. Calculate the freezing point of an aqueous solution containing 10.50 g of MgBr, in 200 g of water (molar mass of MgBr, = 184 g mol ', Ky for water is 1,86 K kg mol"). Delhi 201184. Calculate the boiling point of a solution prepared by adding 15.00 g of NaCl to 2500 x of water, (Ky for water = 0.512 K kg mot! molar mass of NaCl= S84. ¢ mo") Delni 2011 85. What would be the molar mass of a compound if6.21 g of itis dissolved in 24.0 g of chloroform form a solution that has a boiling point of 68.04°C, The oiling point of pure chlorofiem is 61,7°C and the boiling point elevation constant, Ky fr chloroform is 263°Cim. Delhi 2011 86. A solution prepared by dissolving 8.95 mg of a gene fragment in 35.0 mL. of water has an osmotic pressure of 0.335 torr at 25°C, Assuming the gene fragment is non-electrolyte, Getermine its molar mass. Delhi 2011; All Indio 2011 87. 4 0.561 m solution of unknown electrolyte depress: the freezing point of water by 2.93°C. What is van't Hoff factor for this electrolyte? The freezing point depression constant (K', for water is L.S6°C kg mol. Foreign 2011 88. Phenol associates in benzene to a certain extent fo form a dimer. A solution containing 20 g of phenol in 1.0 kg of benzene has its freezing point lowered by 0.69 K. Calculate the fraction of phenol that has dimerised. (Given : Ky for benzene = 5.1 K kg mol"). pgi45 20116 — & Geaa eA | @ First calculate M, (observed) by using the formula, iy = KE%2 X1000 aT (i) Calculate 7 by using the formula, j = “2 (Calculated) ™M, (Observed) it (i) Calculate a by using the formula, a = | 1 (-) 89. An aqueous solution containing 12.48 g of barium chloride in 1.0 ke of water boils at 373.0832 K. Calculate the degree of dissociation of barium chloride. (Given : K, for H,0=0.52 K kg mol”', molar mass of BaCl, = 208.34 g mol!). Delhi 20116 90. At 300 K, 36 g of glucose, CHO, present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of another glucose solution is 1.52 bar at the same temperature, calculate the concentration of the other solution. AllIndia 2011 bi ——Choptenwise CBSE Question Bank : CHEMtg Mh, 91, Calculate the boiling point of one molar a solution, Density of KBr solution is LOG ge (Ky for 1,0 = 0.52 K kg mol, atomic mass op K=39, Br =80), All ini Soe | QE IDEA > (9 Caleulatethemolalty ofsoltionbyusing theo | me—_Mnt000__ (1000 =) -(MH4,) (where, M-=molaity d = density and My «may 288 Of slug | GW Calculate A7, by using the formula, AT, = ikym (ai) Calculate T,(boling point of solution by using the formula, Ty + AT, =Ty L 92. A solution prepared by dissolving 1.25 g of oil of wintergreen (methyl salicylate) in 99.0 g of benzene has a boiling point of 80.31°C. Determine the molar mass of this compound. (Boiling point of pure benzene = 80.10°C and K', for benzene : “i = 253°C kg mol), Delhi 2010; Foreign 204 93, What mass of ethylene glycol (molar mass 62.0 g mol”) must be added to 5.50 kg of water to lower the freezing point of water from 0°C to ~ 10.0°C? (K, for water= 1.86 K kg mol") guy ingig 2010 94, 0.1 mole of acetic acid was dissolved in | kg of benzene. Depression in freezing point of benzene was determined to be 0.256 K. What conclusion can you draw about the state of the solute in solution? (Given : K¢ for benzene = 5.12 K kg mol™'), Delhi 2010¢ 95. Calculate the mass of ascorbic acid (CgH,0,) t0 be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C (Ky for acetic acid is 3.9 K kg mol ') ‘All ndia 2010 5 Marks Questions 96. (i) Define reverse osmosis. Gi) Why are aquatic species more comfortable in cold ter in comparison to warm water? (ii) A solution containing 2 g of glucose (Af=180 g mol” ') in 100 g of water is prepared at 303 K. If the vapour pressure of pure water at 303 K is 32.8 mm Hg, what would be the vapour case 2024 pressure of the solution?Solutions: 97. (i) What is the effect of temperature on the solubility of glucose in water? i) Ibrahim collected a 10mL. each of fresh water and ocean water. He observed that one sample labelled P froze at 0°C while the other Q at -1,3°C. Ibrahim forgot which of the two, P or Q was acean water. Help him identify which container contains ocean water, giving rationalisation for your answer. Calculate van't Hoff of Ky[Fe(CN),, factor fran aqueous solution 1e degree of dissociation (1) is 0.852, What will be boiling point of this solution if its concentration is 1 molal? (Ky, = 0.52 K kp/mol) case sap 2024 98. (i) Why is boiling point of 1 M NaCl solution more than that of I M glucose solution? (ii) A non-volatile solute “X" (molar mass =50 g mol”') when dissolved in 78 g of benzene reduced its vapour pressure to 90%. Calculate the mass of X dissolved in the solution. Calculate the boiling point elevation for a solution prepared by adding 10 g of MgCl, to 200 g of water assuming MgCl, is completely dissociated. (K,, for water =0.512 K kg mol~!, Molar mass MgCl, =95 g mol~') case 2023 99. (i) Why is the value of van't Hoff factor for ethanoie acid in benzene close to 0.5? (i) Determine the osmotic pressure of a solution prepared by dissolving 232x107? g K,SO, in2 L. of solution at 25 °C, assuming that K,SO, is completely dissociated. (R =0.082 L atm K~! mol”!, Molar mass K,SO, =174g mol~') = 21 (iii) When 25.6 g of sulphur was dissolved in 1000 g of benzene, the freezing point lowered by 0.512 K. Calculate the formula of sulphur (S, ). (K ; for benzene = 512K kg mol”!, Atornic mass ‘of sulphur = 32g mol!) cese 2023 400. (i) A 10% solution (by mass) of sucrose in water has a freezing point of 269.15 K.CBSE 2023, All nda 2017 Calculate the freezing point of 10% glucose in water if the freezing point of pure water is 273.15 K. (Given : Molar mass of sucrose =342.g mol! and molar mass of glucose = 180 g mol") (i) Define the following terms. (a) Molality (m) (b) Abnormal molar mass 101. (i) Calculate the freezing point of solution when 1.9 g of MgCl, (M = 95 g mol”) was dissolved in 50 g of water, assuming MgCl, undergoes complete ionisation. (K , for water =1.86 K kg mol!) (ii) (@) Out of I M glucose and 2 M glucose, which one has a higher boiling point and why’? (b) What happens when the external pressure applied becomes more than the osmotic pressure of the solution? Delhi 2016 102. (i) When 2.56 g of sulphur was dissolved in 100 g of CS,, the freezing point gets lowered by 0.383 K. Calculate the formula of sulphur (S,.). (K , for CS, = 3.83 K kg mol”', Atomic mass of sulphur = 32g mol™') (Gi) Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing (a) 1.2% sodium chloride solution? (b) 0.4% sodium chloride solution? Delhi 2016