Choose the correct statement with respect to the vapour pressure of a liquid among the following :

Increases non-linearly with increasing temperature

Decreases non-linearly with increasing temperature

Decreases linearly with increasing temperature

Increases linearly with increasing temperature

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IMPORTANT

Earn 100

How many of the following solutions show negative deviation from Raoult's Law ?

Liquid $A$ Liquid $B$

$(i)$ $({CH}_{3})_{2} CO$ ${CS}_{2}$

$(ii)$ ${CCl}_{4}$ $C_{6} H_{6}$

$(iii)$ ${CCl}_{4}$ ${CHCl}_{3}$

$(iv)$ $H_{2} O$ $C_{2} H_{5} OH$

$(v)$ $(C_{2} H_{5})_{2} O$ $({CH}_{3})_{2} CO$

$(vi)$ ${CH}_{3} COOH$ $C_{5} H_{5} N (pyridine)$

$(vii)$ $C_{6} H_{5} {NH}_{2}$ $({CH}_{3})_{2} CO$

$(viii)$ $C_{6} H_{5} Cl$ $C_{6} H_{5} Br$

$(ix)$ Cyclohexane Ethanol

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Important Questions on Solutions

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 27

0.1 mole {XY}_{2}

is dissolved in

2 L

water, where it ionizes to give

X^{2 +} and Y_{2}^{2 -}

. Observed osmotic pressure is

3 atm

. Molar mass of

X

24

and

Y

32

. Find

M_{observed} + 2 i

(where

M_{observed}

is observed molar mass of

{XY}_{2}

) (Use

R = 1 / 12 L

{atm}^{- 1} {mol}^{- 1}

K

and temperature is

87 ° C

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 28

How many grams of sucrose

(C 12 H 22 O 11)

must be dissolved in

90 g

of water to produce a solution over which the relative humidity is

80 %

? Assume the solution is ideal. Give your answer after dividing by

10

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 29

1.22 g

of a monobasic acid is mixed in

100 g

of benzene. The boiling point of the solution increases by

0.13 º C

with respect to pure benzene. Find the molecular mass of acid in benzene solvent (in

u

u). Report your answer after dividing it by

100

and round it off to nearest integer. (

Kb

of benzene

= 2.6 K kg {mol}^{- 1}

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 30

1 g

of a monobasic acid dissolved in

200 g

of water lowers the freezing point by

0.186 º C

. On the other hand, when

1 g

of the same acid is dissolved in water to make the solution

200 mL

, this solution requires

125 mL of 0.1 M NaOH

for complete neutralization. Calculate

%

dissociation of acid.

(K = 1.86 \frac{K - kg}{mol})

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 31

27 º C, a 1.2 %

solution

(weight / volume)

of glucose is isotonic with

4.0 g / litre

of solution of solute

X

. Find the molar mass of

X

, if the molar mass of glucose is

180 . (R = 0.082 L atm {mol}^{- 1} K^{- 1}

, Molar mass of glucose

= 180 g {mole}^{- 1}

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 33

We have

100 mL

0.1 M KCl

solution. To make it

0.2 M,

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 34

Which of the following concentration factors can be calculated if the

mole

fraction and density of an aqueous solution of

HCl

are known?

HARD

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IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 36

According to Henry’s law, the partial pressure of gas

(P_{g}^{'})

is directly proportional to the

mole

fraction of gas in the dissolved state, i.e.,

P_{gas}^{'} = K_{H} . X_{gas}

where,

K_{H}

is Henry’s constant. Which are correct?

	Liquid $A$	Liquid $B$
$(i)$	$({CH}_{3})_{2} CO$	${CS}_{2}$
$(ii)$	${CCl}_{4}$	$C_{6} H_{6}$
$(iii)$	${CCl}_{4}$	${CHCl}_{3}$
$(iv)$	$H_{2} O$	$C_{2} H_{5} OH$
$(v)$	$(C_{2} H_{5})_{2} O$	$({CH}_{3})_{2} CO$
$(vi)$	${CH}_{3} COOH$	$C_{5} H_{5} N (pyridine)$
$(vii)$	$C_{6} H_{5} {NH}_{2}$	$({CH}_{3})_{2} CO$
$(viii)$	$C_{6} H_{5} Cl$	$C_{6} H_{5} Br$
$(ix)$	Cyclohexane	Ethanol

How many of the following solutions show negative deviation from Raoult's Law ? Liquid A Liquid B (i) (CH3)2CO CS2 (ii) CCl4 C6H6 (iii) CCl4 CHCl3 (iv) H2O C2H5OH (v) (C2H5)2O (CH3)2CO (vi) CH3COOH C5H5N (pyridine) (vii) C6H5NH2 (CH3)2CO (viii) C6H5Cl C6H5Br (ix) Cyclohexane Ethanol

Important Questions on Solutions

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