Solutions Questions and Answers

3 Water is oxidized to oxygen during photosynethesis 4 Water can act both as an acid and as a base The buffer system which helps to maintain the pH of blood between 7 26 to 7 42 is 1 H CO HCO 2 NH OH NH C 3 CH COOH CH COO 4 CH CC

A sample of air containing 20 O2 and 80 N is dissolved in water when total pressure of air is 1 atm The solubility of N and O in terms of mole fraction is x and y This sample is taken at a height of H above sea level where pressure of air is 0 4 atm and temperature is 300 K and solubility of N and 0 in terms of mole fraction is x and y Assume that value of Henry s constant remains x y same at sea level and H The value of is

8 An organic compound compound contains carbon hydrogen and oxygen Its elemental analysis gave C 40 H 6 67 and O 53 33 The empirical formula of the compound is 1 CH3O 2 C H4O 3 CH2O 4 CH4O 9 12 044 x 1022 molecules of glucose are present in 500 mL of its solution The molarity of the solution is 1 0 01 M 3 0 01 M 2 0 4 M 1 02 M

0 A gaseous mixture contains equal masses of O2 and SO2 The molar ratio of the two gases in the mixture is 1 2 3 2 2 1 3 4 1 4 1 4 1 Mole fraction of the solute in a 2 molal aqueous solution is 1 0 17 3 0 035 2 0 017 4 0 35

In a 0 2 molal aqueous solution of a weak acid HX the degree of ionization is 0 3 The freezing point of the solution is nearest to Kf of water 1 85 Question Type Single Correct Type 1 0 360 C 20 480 C 3 0 260 C

3 The chemical potential of pure benzene decreases by 250 J when an amount of paraffin wax is dissolved in it at 25 C and 1 atm At what temperature does this solution boil M Benzene 78 11 g mol Boiling point of pure benzene 80 1 C Boiling point constant of benzene K 2 53 K kg mol

A 0 001 molal aqueous solution of a complex M4 has the freezing point of 0 0054 C If th primary valency of the salt undergoes 100 ionization and K for water 1 8 Kmolal the corre representation of complex is 1 M 3 MA JA 4 MA 4 2 MA 4 Copper pyrite ore is concentrated by

EXAMPLE 2 30 Phenol associates in water to double molecules The values of observed and calculated molecular weight of phenol are 161 84 and 94 respectively The degree of association are 161 84 and 94 respectively The degree of association of phenol will be a 60 b 84 c 45 d 80

The vapour pressure of benzene and toluene in pure state are 700 and 600 mm of Hg respectively When mol of benzene and 4 mol of toluene are mixed together then the vapour pressure of solution will be 680 mm 650 mm 620 mm 600 mm

Intermolecular forces between n hexane and n heptane are nearly same as between hexane and heptane individually When these two are mixed which of the following is now true about the solution formed a It obeys Raoult s law i e p xp and p X P s b AH is zero c AV is zero fish for

The vapour pressure of a solvent A is 0 80 atm When a non volatile substance B is added to this solvent its vapour pressure drops to 0 6 atm What is mole fraction of B in solution a 0 25 c 0 75 MP PMT 2000 01 UPSEAT 2003 MP PET 2003 J K CET 2010 Odisha JEE 2010 b 0 50 d 0 90

Intermolecular forces between n hexane and n heptane ares nearly same as between hexane and heptane individually When these two are mixed which of the following is not true about the solution formed a It obeys Raoult s law i e p xp and p X P b AH is zero c AV is zero d It forms minim

Que 19 0 7g of a sample of Na2CO3 xH2O were dissolved in water and the volume was made to 100 ml 20 ml of this solution required 19 7 ml of N 10 HCI for complete neutralization The value of x is O 7

d 15 75 24 The equivalent conductivity of monobasic acid at infinite dilution is 348 ohm 1 cm eq If the resistivity of the solution containing 15 g acid molar mass 49 in 1 litre is 18 5 ohm cm what is the degree of dissociation of acid a 45 9 c 60 4 b 40 2 d 50 7

The vapour pressure of water at 20 C is 17 54 mm When 20g of a non ionic substance is dissolved in 100g of water the vapour pressure is lowered by 0 30 mm What is the molecular UPSEAT 2001 weight of the substances a 210 2 c 215 2 b d 206 88 200 8 our pressure

33 An aqueous solution of N gas obeys Henry s law at very low concentration of gas in wate nN nwater How many moles of N gas will dissolve in 18 kg water at 27 C and 1 6 107 Pa KH Henry s law constant for N gas in water at 27 C 80 K bar ID Q 529195 Correct answer is 2

EXAMPLE 2 25 If the radiator of an automobile contains 12 L of water how much would the freezing point be lowered by the addition of 5 kg of prestone glycol C H4 OH How many kg of Zeron methyl alcohol would be required to produce the same result

4 go 24 An element X of atomic mass 25 0 exists as X i benzene to the extent of 100 When 10 30 saturated solution of X in benzene is added to 20 0 g of benzene the depression in freezing point o the resulting solution is 0 51 K If K for benzene is 5 1 Kkgmol the solubility of X in 100 g d benzene will be 1 2 9 g 2 3 0 g 3 0 7 g 4 0 3 g R S asr 30 19 sw To Iniog anilin SU xaja c

2 What will be the molarity of a solution which contains 5 85 g of NaCl s per 500 mL a 4 mol L 1 c 0 2 mol L 3 If 500 ml b 20 mol L 1 d 2 mol L

c 20 30 d 30 20 7 Concentrated aqueous sulphuric acid is 98 H SO by mass and has a density of 1 80 g mL Volume of acid required to make one litre of 0 1 M H SO solution is a 11 10 mL b 16 65 mL c 22 20 mL d 5 55 mL

42 Which of the following molarity values of ions in a aqueous solution of 5 85 w v NaCl 5 55 w v CaCl and 6 w v NaOH are correct Na 23 Cl 35 5 Ca 40 16 a CH 2M c Ca2 0 5 M b OH 1 5 M d All of these 48

The Kip of Cd OH 2 in 7 2x10 15 Cd2 aq 2 e Cd s 0 40 V Part A Calculate the standard electrode potential for half reaction Ca OH 2 0 2e Cd a 2OH aq Express your answer to two decimal places and include the appropriate units A 0 82 V

EXAMPLE 2 22 At 17 C the osmotic pressure of sugar solution is 580 torr The solution is diluted and the temperature is raised to 57 C when the osmotic pressure is found to be 165 torr The exten of dilution is a 2 times b 3 times c 4 times d 5 times

17 What is the pH of the solution that results when 0 093 g of Mg OH 2 is mixed with a 75 0 mL of 0 0500 M HCl b 100 0 mL of 0 0500 M HCl c 15 0 mL of 0 0500 M HCI d 30 0 mL of 0 0500 M MgCl

What is the molarity of SO ion in aqueous solution that contain 34 2 ppm of Al2 SO4 3 Assume complete dissociation and density of solution 1g mL A 3 10 M C 10 M B 2 10 M D None of these

d 60 23 38 Insulin C2H1005 n is dissolved in a suitable solvent and the osmotic pressure T of solutions of various concentrations C g cm is measured at 20 C The slope of a plot of against C is found to be 4 65 x10 3 The molar mass of the insulin is 3 a 4 8x105 b 9 105 d 5 17 106 c 3x105

Which of the following azeotropic solutions ha the boiling point less than the boiling point of its constituents molecules 1 CHCl3 and CH3COCH 3 CH3COOH C6H5NH 2 3 4 All of these CH3CH OH and CH3COCH3

3 Wolframite is FeWO MnWO 4 Cassiterite and rutile are sulphides ore The osmotic pressure of solution containing 34 2 g of cane sugar molar mass 342 g mol in IL of solution at 20 cis Given R 0 082 L atm K mol 1 2 40 atm 2 3 6 atm 3 24 atm 4 0 0024 atm C H OH CHCI NaOH Salicylaldehyde the electrophile involved in the above reaction is

In the process shown in the figure on an ideal diatomic gas the value of q and AH respectively is PA A79 5 P V and 94 5 P V C 12 P V and 0 the reaction COCI n 7P P V 4V B 55 5 P V and 94 5 P V D 79 5 P V and defined P varies

The boiling point of acetic acid is 118 1 C and its latent heat of vaporisation is 121 cal gm A solution containing 0 4344 gm anthracene in 44 16 gm acetic acid boils at 118 24 C What is the molecular wt of anthracene 1 122 2 178 3 105 4 154 1

4 None of these 1 1 44 2 56 10 equivalent of KOH is required to neutralize 0 12544g H XO The atomic mass of X ing mol is Given H XO is a dibasic acid 2 8 1 16 3 7 Which one of the following compounds is a peroxide 2 BaO 1 KO 3 MnO 4 32 4 NO

The total vapour pressure of a 8 mole solution of NH3 in water at 293 K is 100 0 torr the vapour pressure of pure water is 34 0 torr at this temperature Applying Henry s and Raoult s laws calculate the total vapour pressure for a 10 mole solution A 58 25

2 The ratio of freezing point depression values of 0 01 M solutions of urea common salt and Na SO4 are 1 1 1 1 2 1 2 1 3 1 2 3 4 2 2 3 3 From a measurement of the freezing point depression of

A mixture of CH4 and C2H occupied a certain volume at a total pressure of 63mm The sample was burnt to CO2 and H O and the CO2 alone was collected and its pressure was found to be 69mm in the same volume and at the same temperature as the original mixture What is the contribution of Ethyne in percentage in the mixture A 90 4 B 80 6 C 26 5

The osmotic pressure shown by 0 1 molar aqueous solution of a weak electrolyte AB is 3 6 atm 300 K Find dissociation of weak electrolyte AB Use R 0 08 L atm K mole Sum the digits of your answer till you get single digit number

EXAMPLE 2 5 Liquids A and B form an ideal mixture in which the mole fraction of A is 0 25 At temperature T a small quantity of the vapour in equilibrium with the liquid is collected and condensed This process is repeated for a second time with the first condensate The second condensate now contains 0 645 mole fraction of A Calculate the ratio PA PB What will be the mole fraction of B in the third condensate

The depression in freezing point of 0 01 M aqueous solutions of urea sodium chloride and sodium sulphate is in the ratio of Roorkee 1990 DCE 1994 1 1 1 1 2 1 2 3 3 1 2 4 4 2 2 3 2 86 From NCERT 3

A gaseous hypothetical chemical 2A4B C is carried out in a closed vessel The concentration of B is found to be increase by 5 x 10 mol L in 10 seconds The rate of appearance of B is 5 x 10 4 mol L sec 5 x 10 5 mol L sec O 6 x 10 5 mol L sec 1 4 x 104 mol L sec 1 O O 1

M 9 If the degree of association is 70 for the reaction 2A the solute A is a 0 30 c 0 35 Sol d A 2 the van t Hoff factor for 7 May 2018 Shift 1 b 0 70 d 0 65 24 4 2 van t Hoff factor i 70 0 7 per unit i e a 0 70 Given where a degree of association n number of units undergo for association a 0 70 i 1 a 1 0 70 71 2 i 0 30 0 35 0 65

A solution containing 4 g of a non volatile organic solute per 100 ml was found to have an osmotic pressure equal to 500 cm of mercury at 27 C The molecular weight of solute is A 14 97 B 149 7 lorations C 1697 D 1 497 B If a 6 84 wt vol solution of cane sugar mol wt 342 is isotonic with 1 52 wt vol solution

3 Both temperature and pressure are increased 4 Both temperature and pressure are reduced Aqueous solution of 0 004 M Na SO and 0 01 M glucose are isotonic The percentage degre dissociation of Na So is 1 85 3 60 4 25 Which of the following statements regarding Nitrogen pentoxide is not correct 2 75

wwwing Determine the process occurring at each labeled point on this graph TEMPERATURE 2 3 COOLING TIME 4 5 A 01 24 03 Time Remaining Epo0000000 9 Gas neating Solid cooling Liquid heating Melting Vaporization Liquid cooling Condensation Freezing Gas cooling 2 points What process is occurring at point 5 Melting Gas cooling Solid cooling Freezing Solid heating Gas heating Vaporization 00000000 Liquid cooling

Pressure Phase diagram Determine the phase of matter or phases occurring at each labeled point on this phase diagram C A E B Temperature F T G D 17 4 points What phase or phases of matter is point A Gas and liquid Solid Solid and liquid Gas Gas and solid Liquid 00000000 Supercritical fluid Gas solid and liquid 18 4 points What phase or phases of matter is point B Solid liquid and gas Supercritical fluid 00000 Gas Gas and liquid Solid and liquid

Mole fraction of benzene in the vapours ove r a solution of benzene and toluene is 0 4 If the original vapour pressure of benzene is 1 50mmHg and toluene is 50mmHg the mole fraction of benzene in the solution is a 0 4 b 0 75 c 0 25 d 0 18

A mixture of 1 60 moles of X gas and 2 70 moles of Y gas are mixed with 6 42 moles of XY gas in a 10 0 L tank at 25 C X Ya 2XY Answer both questions a If the Ke for this reaction is 2 4 x 102 at this temperature is the reaction at equilibrium b If not what is the direction of the net reaction

7 How many ions are produced from the complex Co NH3 6 Cl2 in solution i 6 ii 4 iii 3 iv 2 VIC ICON Lio

Select the statements that describe the result when a nonvolatile solute is dissolved in a liqui solvent Check all that apply The boiling point of the solution is lower than that of pure solvent The boiling point of the solution is higher than the boiling point of pure solvent The amount that the boiling point increases is dependent only on the concentration of dissolved particles The amount that the boiling point increases is dependent on the identity of the solute Do you know the answer

The molar conductivities at infinite dilution of barium chloride sulphuric acid and hydrochloric acid are 280 860 and 426 S cm mol 1 respectively The molar conductivity at infinite dilution of barium sulphate is S cm mol 1 Round off to the Nearest Integer ven 288 er

Arrange the following aqueous solutions in order of increasing boiling poin Assume all dissociate completely in solution and have the same Kb Highest boiling point 1 2 3 A 0 250 M Na2SO4 aq 0 300 M MgSO4 aq 0 100 M NaCl aq 0 100 M NH3 aq

Assuming 100 ionisation in case of strong electrolytes which of the following will have minimum pH 1 0 01 M NH4Cl 2 0 01 M NH4 2SO4 3 0 01 M NH4 3PO4 4 All will have same pH If equilibrium constant of the reaction of weak acid HA with NaOH is 10 then pH of 0 1 M NaA is 1 2 3 4 109 P 1