MEDIUM

JEE Main

IMPORTANT

Earn 100

The depression in freezing point observed for a formic acid solution of concentration $0.5 mL L^{- 1}$ is $0.0405 ° C$ . Density of formic acid is $1.05 g {mL}^{- 1}$ . The Van't Hoff factor of the formic acid solution is nearly: (Given for water $k_{f} = 1.86 K kg {mol}^{- 1}$ )

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Important Questions on Solutions

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 25 July 2022 Shift 2>Q 94

Two solutions

A

and

B

are prepared by dissolving

1 g

of non-volatile solutes

X

and

Y

. respectively in

1 kg

of water. The ratio of depression in freezing points for

A

and

B

is found to be

1 : 4

. The ratio of molar masses of

X

and

Y

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 July 2022 Shift 1>Q 95

When

800 mL

0.5 M

nitric acid is heated in a beaker, its volume is reduced to half and

11.5 g

of nitric acid is evaporated. The molarity of the remaining nitric acid solution is

x \times 10^{- 2} M

. (Molar mass of nitric acid is

63 g {mol}^{- 1}

)

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 July 2022 Shift 2>Q 96

The elevation in boiling point for

1

molal solution of non-volatile solute

A

3 K

. The depression in freezing point for

2

molal solution of

A

in the same solvent is

6 K

. The ratio of

K_{b}

and

K_{f}

i.e.,

K_{b} / K_{f}

1 : X

. The value of

X

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 27 July 2022 Shift 1>Q 97

Boiling point of a

2 %

aqueous solution of a nonvolatile solute

A

is equal to the boiling point of

8 %

aqueous solution of a non-volatile solute

B

. The relation between molecular weights of

A

and

B

is.

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 27 July 2022 Shift 2>Q 98

When a certain amount of solid

A

is dissolved in

100 g

of water at

25 ° C

to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is

23.76 mmHg

. The number of moles of solute

A

added is

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 28 July 2022 Shift 1>Q 99

150 g

of acetic acid was contaminated with

10.2 g

ascorbic acid

(C_{6} H_{8} O_{6})

to lower down its freezing point by

(x \times 10^{- 1}) ° C

. The value of

x

is____ (Nearest integer). [Given

K_{f} = 3.9 K kg {mol}^{- 1}

; Molar mass of ascorbic acid

= 176 g {mol}^{- 1}

]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 28 July 2022 Shift 2>Q 100

A gaseous mixture of two substances

A

and

B

, under a total pressure of

0.8 atm

is in equilibrium with an ideal liquid solution. The mole fraction of substance

A

0.5

in the vapour phase and

0.2

in the liquid phase. The vapour pressure of pure liquid

A

is____atm.(Nearest integer)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 29 July 2022 Shift 1>Q 101

O_{2}

gas is bubbled through water at

303 K

, the number of millimoles of

O_{2}

gas that dissolve in

1

litre of water is____(Nearest integer) (Given : Henry's Law constant for

O_{2}

303 K

46.82 k

bar and partial pressure of

O_{2} = 0.920

bar)
(Assume solubility of

O_{2}

in water is too small, nearly negligible)

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L-1 is 0.0405 °C. Density of formic acid is 1.05 g mL-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water kf=1.86 K kg mol-1)

Important Questions on Solutions

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The depression in freezing point observed for a formic acid solution of concentration $0.5 mL L^{- 1}$ is $0.0405 ° C$ . Density of formic acid is $1.05 g {mL}^{- 1}$ . The Van't Hoff factor of the formic acid solution is nearly: (Given for water $k_{f} = 1.86 K kg {mol}^{- 1}$ )