Solutions Questions and Answers

0 At 88 C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr What is the mole fraction of benzene in the mixture with toluene that will boil at 88 C at 1 atm pressure benzene toluene form an ideal solution 1 0 416 3 0 688 2 0 588 4 0 740

An electrolyte A dissociates into 3 ions in its aqueous solution The osmotic pressure of an aqueous solution with concentration equal to 0 1 M non electrolyte solute B is Under identical conditions what will B be the osmotic pressure of 0 05 MA

For 1 H SO4 solution find it s normality approx 1 0 1 2 0 2 3 0 4 4 0 02

Under identical conditions what will be the osmotic pressure of 0 01 M KI solution compared to the osmotic pressure of 0 1 M glucose solution A 10 B T 5 2 39 1 C T 20 D 2

At 40 C the vapour pressure in torr of mixture of methyl alcohol and ethyl alcohol is representated by P 199x 135 P PA PB where x is the mole fraction of methyl alcohol What are the vapour pressures of pure methyl alcohol and pure ethyl alcohol at 40 C 1 135 and 254 torr PAXD 2 119 and 135 torr 3 119 and 254 torr u bor PA 199 P 22 32 CH OH O 322 34

low are present 4 09 2020 many equivalents of Kt and So ions in 0 5eq K S04

ILLUSTRATION 14 0 6 mL of acetic acid CH3COOH having density 1 06 g mL 1 is dissolved in 1 litre of water The depression in freezing point observed for this strength of acid was 0 0205 C Calculate the van t Hoff factor and the dissociation constant of acid

The freezing point depression of a 1 00 x 10 m solution of K Fe CN 6 is 7 10 x 10 3 K Determine x Given K 1 86 K kg mol 1 for H O Assume 100 dissociation

lectronegativity radius cain enthalpy ins 92 g of molality of 4 16 ll is est ate st Experiment A in mol II 45 I III 1 5 The following results were kinetic studies of the reaction 2A B Products L 0 10 0 10 0 20 B in mol L 2 10 0 20 0 25 0 30 The time in minutes required to consume half of A is Initial Rate of reaction in mol L 1 min 6 93 x 10 3 6 93 x 10 3 1 386 10 3 1 4 100 H The alkaline earth metal nitrate not crystallise with water is 1 Mg NO3 2 3 Ca NO3 2 4 48 20 mL of 0 1 M H SO4 sol 30 mL of 0 2 M NH OH sc the resultant mixture is pK of NH OH 4 7 49 1 5 2 3 5 0 Adsorption of a ga adsorption isotherm mass of the gas ads

The density of 2 M aqueous solution of NaOH is 1 28 g cm The molality of the solution is Given that molecular mass of NaOH 40 g mol 1 1 20 m 2 1 56 m 3 1 67 m 4 1 32 m

FeCl3 on reaction with K Fe CN 6 in aq solution gives blue colour These are separated by a semipermeable membrane PQ as shown Due to osmosis there is 0 1M K Fe CN 111 P Side X 0 01M FeC Side Y 1 blue colour formation in side X 2 blue colour formation in side Y 3 blue colour formation in both of the sides X and Y 4 no blue colour formation

Two liquids A and B have vapour pressure in the ratio P P 2 3 at a certain temperature Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase is 1 3 then the mole fraction of A in the solution at the same temperature is 1 3 113 114 2 4 2 A w w N

Relative decrease in vapour pressure of an aqueous NaCl is 0 181 Number of moles of NaCl present in 180g of H O is consider 100 dissociation of NaCl

The vapour pressure of benzene at a certain temperature is 640 mm of Hg A non volatile and non electrolyte solid weighing 2 175 g is added to 39 08 g of benzene If the vapour pressure of the solution is 600 mm of Hg what is the molecular weight of solid substance 1 49 50 3 69 46 2 59 60 4 79 82

Relative decrease in vapour pressure of an aqueous solution containing 2 moles Cu NH3 3 CI Cl in 3 moles H O is 0 50 On reaction with AgNO3 this solution will form assuming no change in degree of ionisation of substance on adding AgNO3 1 1 mol AgCl 3 0 5 mol AgCl 2 0 25 mol AgCl 4 0 40 mol AgCl

35 What volume of 75 alcohol by weight d 0 8 g cm must be used to prepare 150 cm of 30 alcohol by weight d 0 9 g cm 3 1 67 5 ml 2 56 25 ml 4 99 9 m 3 44 44 ml

The aqueous solution that has the lowest vapour pressure at a given temperature is a 0 1 M sodium phosphate b 0 1 M barium chloride c 0 1 M sodium chloride d 0 1 M glucose

Which of the following solution has maximum vapour pressure 1 1 1 N KNO3 31 N AL SO 2 I in add II 1 5 3 2 1 N Ba NO 2 4 IN Ti NO 5 in KL solution The freezing

1 mole heptane V P 92 mm of Hg is mixed with 4 mol Octane V P 31 mm of Hg from an ideal solution Find out the vapour pressure of solution

solute per 100 mL was found to have an osmoti pressure equal to 500 cm of mercury at 27 C Th molecular weight of the solute is 1 14 99 g 2 149 9 g 3 1499 g 4 1 499 g

following terms ns i Cryoscopic Constant ii Parts per million b 100 mg of a protein is dissolved in enough water to make 10 0 mL of a solution If this solution has an osmotic pressure of 13 3 mm Hg at 25 C wh is the molar mass of protein R 0 0821 L atm mol K and 760 mm Hg 1 atm

F P of solution 10 33 C Ans 10 33 C A 0 01 molal solution of ammonia freezes at 0 02 C Calculate the van t Hoff factor i and the percentage dissociation of ammonia in water KF H O 1 86 deg molal

p 0 5 x 0 082 x 300 14 76 atm Ans TC If 200 ml of 0 2 M BaCl solutions is mixed with 500 ml of 0 1 M Na SO4 solutions Calculate of resul solutions

So density 6 9 56 100 1 X 30 1 1288 g It Ans 10 ml of sulphuric acid solution sp gr 1 84 contains 98 by weight of pure acid Calculate the volume of 2 5 M NaOH solution required to just neutralize the acid 98

C V C V2 V V net Now T Cnet V P of solute containing 6 g of non volatile solute in 180 g of water is 20 Torr mm of Hg If 1 mole of water is further added in to the V P increses by 0 02 Torr calculate V P of pure water molecular wt of non volatile solute m 54 g mol RT

A 6 90 M solution of KOH in water has 30 by weight of KOH Calculate density of solution Let V 1 It then moles of solute 6 9 wt of solute 6 9 56 g 100

ive 6 66 ml of a solution containing HCI with KIO is treated with excess of KI and I liberated and it titrated with 400 ml 0 1 M hypo solution Calculate molarity of KIO in solution

x mole of KCI and y mole of BaCl are both dissolved in 1 kg of water Given that x y 0 1 and K for water is 1 86 K molal What is the observed range of AT if the ratio of x and yi varied 1 0 37 to 0 55 3 0 56 to 0 93 2 0 185 to 0 93 4 0 37 to 0 93

2 The mole fraction of water in 20 wt wt aquec solution of H O2 is 68 77 a 77 68 b c 20 d 80 80 20

SOIS are also called reversible colloids because a they can be reformed by mixing residue dispersed phase in dispersion medium even after drying b they can be easily precipitated from the colloidal system c once formed the dispersion medium and dispersed phase cannot be separated d special reversible reactions are used to prepare

The ratio of the value of colligative properties K Fe CN aq to that of Fe Fe CN 3 aq is Assuming 100 dissociation 1 4 3 3 5 7 2 3 4 4 7 5

capacity 500 One of these beakers labeled as A was filled with 400 mL water whereas the beaker labeled B was filled with 400 mL of 2 M solution of NaCl At the same temperature both the beakers were placed in closed containers of same material and same capacity as shown in figure B C A D water At a given temperature which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution A Vapour pressure in container A is more than that in container B B NaCl solution Vapour pressure in container A is less than that in container B Vapour pressure is equal in both the containers Vapour pressure in container B is twice

Calculate the mass of non volatile solute having molecular mass 40 which should be dissolved in 57 gm octane to reduce its vapour pressure to 80

9 The vapour pressure of an aqueous solution of glucose is 750 mm Hg at 373 K The molality of this solution at the same temperature is 1 0 74 molal 2 0 84 molal 3 0 70 molal 4 0 50 molal

The vapour pressure of two pure liquids A and B that form an ideal solution are 100 and 900 torr respectively at temperature T This liquid solution of A and B is composed of 1 mole of A and 1 mole of B What will be the pressure when 1 mole of mixture has been vaporized a 800 torr b 500 torr c 300 torr d None of these rectly the changes in thermodynamic properties during

must 3 Equimolal solutions of KCl and compound X in water shows depressions in freezing point in the ratio of 4 1 Assuming KCl to be completely ionized the compound X in solution 02 11 to w loM 02 H to virstom od statusle a dissociate to the extent of 50 b hydrolyse to the extent of 80 c dimerize to the extent of 50 d trimerize to the extent of 75 llo sd to do MIRI 101

d None of these A sol is prepared by addition of excess of AgNO3 solution in KI solution The charge likely to develop on colloidal particles is ugh b negative d both charges numbers of protective colloids A B C and D are 0 04 0 004 10 and 40 respectively a positive c no charge

al test At 88 C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr What is the mole fraction of benzene in the mixture with toluene that will be boil 88 C at 1 atm pressure benzene toluene form an ideal solution FC

ILLUSTRATION 8 20 A solution of 3 0 x 10 kg of camphor C10H160 in 25 3 x 103 kg of chloroform boils at 61 3 C If the boiling point of chloroform is 61 0 C calculate K and AHvap of chloroform

Aluminium oxide contains 52 90 aluminium and carbon dioxide contains 27 27 carbon Calculate the percentage of aluminium in aluminium carbide assuming that the law of reciprocal proportions is Ans 75 true

mctive Find the current supplied in amp for electrolysis of 300 ml aqueous NaCl solution If after 5 minuters pH of final solution was found to be 12 with current efficiency 96 5

benzene and toluene 4 water and HCI On mixing 10 mL of acetone with 40 ml of chloroform the total volume of the solution is 1 50 mL 2 50 mL 3 50 mL The mixture of n hexane and n heptane is an even 4 cannot be predicted

An aqueous solution is 1 00 molal in change will cause the vapour pressure of the solution to increase A B C D Addition of NaCl Addition of Na2SO4 Addition of 1 00 molal KI Addition of water

e solvent zing point ile solute qual to m s of 8 A Which of the following statements is correct The freezing point of water is depressed by the addition of glucose The degree of dissociation of a weak electrolyte decreases as its concentration decreases B C D Energy is released when a substance dissolves in water provided that the hydration energy of the substance is more than its lattice energy If two liquids that form an ideal solutio are mixed the change in entropy

When 1 0 mL of dil HCl acid is added to 100 mL of a buffer solution of pH 4 0 The pH of the solution 1 Becomes 7 r 2 3 Becomes 2 Does not change 4 Becomes 10

9 For complete neutralisation of 25 mL of Na CO3 solution specific gravity 1 25 g mL 1 32 9 mL of HCl solution containing 109 5g of the acid per litre is required Calculate the volume of 0 84 N H SO4 that will be neutralised by 125 g of Na CO3 solution

0 5 mol NaCl is dissolved in 500g H O Th determine freezing point and boilling point solution Given K H O 1 8 K kg mol Kb H 0 0 5 K kg mol 1 1 8 C 100 5 C 2 3 6 C 101 C 3 3 6 C 99 4 0 C 100 C

100 g CH 2O6 aq face fai fare 12 40 to facena 93 C Tech full 1 95 5 g al 2 4 5 g 40 18 torr f for k 1 86 kg mol 3 45 5 g 4 47 8 q

The empirical formula of a non electrolyte is CH O A solution containing 6 g of the compound exerts the same osmotic pressure as that of 0 05 M glucose solution at the same temperature The molecular formula of the compound is a C H O c CsH10Os b C H O d C H O 2010

14 The plot given below shows p T curves where p is the pressure and 7 is the temperature for two solvents X and Y and isomolal solutions of NaCl in these solvents NaCl completely dissociates in both the solvents 1 2 ADID vig inson 0 H 760 Pressure mmHg g Temperature K DOR 1 solvent X 2 solution of NaC in solvent X 3 solvent Y 300 4 solution of NaCl in solvent Y On addition of equal number of moles of a non volatile solute S in equal amount in kg of these solvents the eleva tion of boiling point of solvent X is three times that of solvent Y Solute S is known to undergo dimerization in these degree of dimerization is 0 7 in solvent Y the degree of dimerization in solvent X is