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QUESTION: 1

**Only One Option Correct Type
This section contains 17 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct**

Q.

Mole fraction of non-electrolyte (A) in aqueous solution is 0.07. One molal urea solution freezes at - 1.86°. Thus, depression in freezing point of the non-electrolyte A is

Solution:

QUESTION: 2

A complex of potassium, iron and cyanide is 100% ionised at 1 m (molal). If the elevation in boiling point is 2.08°, then complex is [K_{b} (H_{2}0 ) = 0.52° mol^{-1} kg]

Solution:

where, y = number of ions of the complex

x = degree of ionisation = 1

∴ y = 4

Four ions are formed from

QUESTION: 3

Select the correct statement(s).

Solution:

Thus, (a) is incorrect

(b) Based on (a), Thus, (b) is correct.

(c) Elevation in boiling point (ΔTb) is a colligative property. Boiling point is not a colligative property. Thus, (c) is incorrect.

QUESTION: 4

What mass of sucrose, C_{12}H_{22}0_{11}, should you dissolve in 100.0 g water to obtain a solution in which mole fraction of C_{12}H_{22}0_{11} is 0.124?

Solution:

QUESTION: 5

The freezing point (in °C) of a solution containing 0.1 g of K_{3}[Fe(CN)_{6}] in 100 g water in which it is 80% ionised is [K_{f} (H_{2}0) = 1.86° mol^{-1} kg]

Solution:

QUESTION: 6

Which represents correct difference?

Solution:

. (a) (I) Entropy change between solution and vapour is smaller than the entropy change between pure solvent and vapour, thus correct.

(II) Heats of vaporisation for a pure solvent and for a solution are similar because similar intermolecular forces between solvent molecules must be overcome in both cases, thus correct.

(III) When a non-volatile solute is added to a solvent, vapour pressure falls hence, boiling point is elevated, thus correct

QUESTION: 7

60 g of urea is dissolved in 1100 g of solution in water. To keep ΔT_{f}/K_{f} as 1 mol kg^{-1}, water separated in the form of ice is

Solution:

(a)

Solute (urea) = 60 g

Solution (urea + water) = 1100 g

∴ Solvent (water) = 1100- 60 = 1040 g

Thus, water separated in the form of ice = 1040 - 1000 = 40g

QUESTION: 8

A solution contains 0.1 mole of acetamide in 1 L of glacial acetic acid. When the solution is cooled, the first crystal that appeared at the freezing point contains the molecule(s) of

Solution:

(b) When a solute is added to a solvent, freezing point is lowered. Thus, freezing point of solution is less than that of the solvent. Let freezing point of solvent = T_{1} and freezing point of solution = T_{2}.,

T_{2} <T_{1}

On lowering temperature, first is attained hence, acetic acid is converted into solid (crystal).

QUESTION: 9

Two moles of the complex (Cu(NH_{3})_{3}Ci]Cl are dissolved in 3 moles of H_{2}0 . Relative decrease in vapour pressure was found to be 0.50. If this solution is treated with aq. AgN0_{3} solution, then there is formation of

Solution:

Cl^{-} from 2 moles complex = 2 x 0.5 = 1.0

∴ AgCI formed = 1 mol

QUESTION: 10

Total volume of a mixture of 46 g ethanol (C_{2}H_{5}OH) and 72 g water (H_{2}0 ) based on the given figure is

Solution:

From the graph, partial molar volume of ethanol when

(X = 0.2) = 55cm^{3 }mol^{-1}

and that of water when ( x = 0.8) = 14cm^{3}mol^{-1}

QUESTION: 11

pH of 0.1 M dibasic acid is found to be 3. Hence, its osmotic pressure at temperature T K is

Solution:

QUESTION: 12

Water is purified by ion-exchange resin (RH_{2}) in which Ca^{2+} in hard water is replaced by H^{+}

RH^{2} + Ca^{2+} ----- >RCa + 2H^{+}

Water coming out of ion-exchange has pH2. Hence, hardness in ppm of Ca^{2+} ion is

Solution:

QUESTION: 13

A sample of drinking water is contaminated with CHCI_{3} to the level of 15 ppm by mass. Thus, mass percentage and molality, respectively are

Solution:

10^{6}g of CHCI_{3} solution has = 15 g of CHCI_{3} (10^{6} - 15)g H_{2}O = 10^{6}g H_{2}0 has = 15 g of CHCI_{3}

10^{3} g of H_{2}O has = 15 x 10^{-3}g CHCI_{3} =

∴ Molality = 1.255 x 10^{-4} mol kg^{-1}

QUESTION: 14

Based on the given dia gram , which of the fo llow ing statem ents regarding the solu tions of two miscible volatile liquids A and B are correct?

I. Plots AC and BD show that Raoult’s law is obeyed for the solution in which A is solute and B is solvent and as well as for that in which B is solute and A is solvent.

II. Plots CD shows that Dalton’s law of partial pressure is observed for the binary solution of components A and 6.

III. In pure state, vapour pressures of volatile liquid differ by 50 units.

IV. Vapour pressure of a mixture containing 40 mole % of B is about 105 units.

Select the correct answer using the codes given below.

Solution:

BC = vapour pressure of pure A = 85 units

As A is added into 6, vapour pressure of A decreases and that of 6 increases.

Thus, AC shows Raoult's law for a solution of S in A (solvent) and SO shows Raoult's law for a solution of A in B (solvent).

Thus, (I) is correct.

Total vapour pressure at any composition is given by line CD, thus (II) is correct.

it is same as given by graph.

Thus, (IV) is also correct.

QUESTION: 15

25 mL of an aqueous solu tion of KCI was fo und to require 20 mL of 1.0 M AgN0_{3} solution when titrated using K_{2}Cr0_{4} as an indicator. Thus, d epression in freezing point of KCI solution with 100% ionisation will be

[K_{f} (H_{2}0 ) = 2.0° mol^{-1} kg, molarity = molality]

Solution:

(b)

Ag ^{+} + Cl^{-} → AgCI

When titration is complete, gives chocolate coloured precipitate with Ag^{+}.

2Ag^{+} + → Ag_{2}Cr0_{4}

This end point is detected.

QUESTION: 16

A 0.001 molal solution of [Pt(NH_{3})_{4}CI_{4}] in water had a depression in freezing point of 0.0054°. K_{f} (H_{2}0 ) = 1.86° mol^{-1} kg (assume 100% ionisation). Thus, com plex is

Solution:

(c)

Let total number of ions due to ionisa tion of the complex = y

NH_{3} is always a ligand, hence Cl can be ligand or ionisable ions.

QUESTION: 17

The complete combustion of 2.40 g of a compound of carbon, hydrogen and oxygen yielded 5.46 g of C0_{2} and 2.23 g of H_{2}0 . When 8.69 g o f the compound was dissolved in 281 g of water, the freezing point depression was found to be 0.97°C. Thus, molecular formula of the organic compound is [K_{f} (H_{2}0 ) = 1.86° mol^{-1} kg)]

Solution:

Oxygen (by difference) = 100 -(62.05 + 10.32)= 27.63%

*Multiple options can be correct

QUESTION: 18

**One or More than One Options Correct Type
This section contains 4 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.**

**Q.**

You have been provided with 10.00% by mass solution of ethanol in water.

At 15°C, density = 0.9831 g mL^{-1}

At 25°C, density = 0.9804 g mL^{-1}

Select the correct statement(s).

Solution:

(a, c)

10% ethanol by mass means

100 g (ethanol + water) solution has = 10 g ethanol

90 g H_{2O }has ethanol = 10 g ethanol

Molality does not involve density, hence same at 15°C and 25°C.

Thus, (c) is correct.

*Multiple options can be correct

QUESTION: 19

One molal aqueous glucose solution has density 1 .180 gm L^{-1}. Also, K_{f} / K_{b} = 3 . Thus,

Solution:

Glucose solution is = 1 mol kg^{-1} water

Solute (glucose) = 180g

Solvent (water) = 1000 g

*Multiple options can be correct

QUESTION: 20

For a mixture of binary c om ponents A and 8 with vapo ur pressures and in pure state, total vapour pressure is

where, X_{B} is mole fraction of component B in the mixture. From this equation, it is concluded that

Solution:

Thus, vapour pressure of 6 increase as Xs increases and decrease as %A decreases.

Line joining and represent total vapour pressure.

Thus, (b) and (c) are also correct.

Note Vapour pressure of A is less than vapour pressure of B . Hence, A is less volatile than B. (d) pt0(a| can also be expressed as

*Multiple options can be correct

QUESTION: 21

If liquids A and B form an ideal solution, then

Solution:

(a, c)

Two liquids (A, B) form an ideal solution, when force of attraction between A and 6 (in mixture) is same as between A and A and between 6 and 6. In such case, Δ H_{mix}= 0.

Since, disorder increases, Δ S_{mix}. Also, process is spontaneous at a given temperature,

ΔG = ΔH - T ΔS = 0 — T ΔS

ΔG_{mix} < 0

QUESTION: 22

**Comprehension Type
This section contains 3 paragraphs, each describing theory, experiments, data, etc. Two questions related to the paragraph have been given.six question related to paragraphs have been given Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)**

**Passage 1**

**Water boils at 100°C at 1 atm pressure. Latent heat of vaporisation (ΔH ) = 10 kcal mol ^{-1}.**

Q.

What is the vapour pressure at 40°C?

Solution:

Variation of vapour pressure with temperature is given Clapeyron-Clausius equation.

p_{1} = 0.07656 atm

p_{1} = 0.07656 x 760 torr = 58.19torr

Vapour pressure at 40°C(313 K) = 58.19 torr

QUESTION: 23

Passage l

W ater boils at 100°C at 1 atm pressure. Latent heat of vaporisation (ΔH ) = 10 kcal mol^{-1}.

Q.

Lowering of vapour pressure of 0.2 molal urea solution at 40°C is

Solution:

Variation of vapour pressure with temperature is given Clapeyron-Clausius equation.

p_{1} = 0.07656 atm

p_{1} = 0.07656 x 760 torr = 58.19torr

Vapour pressure at 40°C(313 K) = 58.19 torr

QUESTION: 24

Vapour pressure diagram for real solutions of two liquids A and B that exhibit a negative deviation from Raoult’s law. The vapour pressure of both A and 8 are less than predicted by Raoult’s law. The dashed lines represent the plots for ideal solutions.

Q.

This type of deviation is also expected in the following mixture.

Solution:

This is a case of negative deviation, thus force of attraction between (A ... B) is larger than average of (A ... A) and (B ... B). Thus, vapour pressure of mixture is decreased, boiling point is increased, hence

ΔH < 0, ΔV = negative

Diethylether and chloroform show negative deviation.

QUESTION: 25

Vapour pressure diagram for real solutions of two liquids A and B that exhibit a negative deviation from Raoult’s law. The vapour pressure of both A and 8 are less than predicted by Raoult’s law. The dashed lines represent the plots for ideal solutions.

Q.

Solution containing components A and 8 shows this type of deviation from ideal behaviour when

Solution:

This is a case of negative deviation, thus force of attraction between (A ... B) is larger than average of (A .... A) and (B....B).

Thus, vapour pressure of mixture is decreased, boiling point is increased, hence

ΔH < 0, ΔV = negative

Diethylether and chloroform show negative deviation.

QUESTION: 26

Passage III

Vapour pressure of binary solution containing 6 g of non-volatile solute in 180 g water is 20.0 torr at 298 K. If one mole of water is further added, vapour pressure increases by 0.02 torr.

Q.

Molar mass of the solute is

Solution:

QUESTION: 27

**Passage III**

Vapour pressure of binary solution containing 6 g of non-volatile solute in 180 g water is 20.0 torr at 298 K. If one mole of water is further added, vapour pressure increases by 0.02 torr

Solution:

*Answer can only contain numeric values

QUESTION: 28

The so-called ozone layer in the earth's stratosphere has an average total pressure of 10 mm with partial pressure of ozone in the layer 1.2 x 10^{-5} mm. What is the concentration of ozone (in ppm) assuming that air is a mixture of N_{2} and 0_{2} is 4 : 1 molar ratio.

Solution:

*Answer can only contain numeric values

QUESTION: 29

The vapour pressure of a solvent is decreased by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. How many times the vapour pressure is decreased when mole fraction of solvent is decreased by 25%?

Solution:

*Answer can only contain numeric values

QUESTION: 30

The freezing point depression of a 1.00x 10^{-3} molal aqueous solution of K_{x}[Fe(CN)_{6}] is 7.1O x 10^{-3} K. If K_{f} (H_{2}O)= 1.86 K kg mol^{-1}, what is the value of x?

Solution:

∴ i = van't Hoff factor = 1 + ( y - 1 )α

where, α = degree of ionisation = 1 = 1 + (x + 1 — 1) 1 = (x + 1)

ΔT_{f} = molality x K_{f} x i

7 x 10^{-3} = 1 x 10^{-3} x 1.86 x (x + 1)

x + 1 = 3.76 = 4

∴ x = 3

QUESTION: 31

**Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct**

Q.

17.1 g of sucrose (C_{12}H_{22}0_{11}) is dissolved in 1000 g of water.

p°(H_{2}0) = 26.50 mm

K_{f} (H_{2}0) = 1.86 mol^{-1} kg

K_{b} (H_{2}0 ) = 0.52° mol^{-1} kg

Match the colligative properties in Column I with their values in Column II and select the answers from the codes given below.

Solution:

*Answer can only contain numeric values

QUESTION: 32

**Direction : This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).**

Q.

**Molarity of Na ^{+} ions in lake water is 4.58 mol L^{-1}.Density of lake water is 1.25 g mL^{-1}.**

Thus, molality of Na^{+} ion i s ...... molal.

Solution:

(4) Molarity = 4.58 mol L^{-1}

1000 mL has 4.58 mol Na ^{+} ions

m/V= Density

∴ Mass of solution = V x d = 1000 x 1.25 g = 1250 g

Na^{+} ions = 4.58 mol = 4.58 x 23 g = 105.34 g

∴H_{2}0 in lake water = 1250 - 105.34= 1144.66g= 1.145 kg

∴ Molality =

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