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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.

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Important Questions on Solutions

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

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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)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 29 July 2022 Shift 2>Q 102

1.80 g

of solute A was dissolved in

62.5 {cm}^{3}

of ethanol and freezing point of the solution was found to be

155.1 K

. The molar mass of solute

A

{gmol}^{- 1}

. [Given: Freezing point of ethanol is

156.0 K

. Density of ethanol is

0.80 g {cm}^{- 3}

. Freezing point depression constant of ethanol is

2.00 K kg {mol}^{- 1}

]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 24 January 2023 Shift 1>Q 103

In the depression of freezing point experiment
A. Vapour pressure of the solution is less than that of pure solvent
B. Vapour pressure of the solution is more than that of pure solvent
C. Only solute molecules solidify at the freezing point
D. Only solvent molecules solidify at the freezing point

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 24 January 2023 Shift 2>Q 104

The Total pressure observed by mixing two liquid

A and B

350 mm Hg

when their mole fractions are

0.7 and 0.3

respectively. The Total pressure becomes

410 mm Hg

if the mole fractions are changed to

0.2 and 0.8

respectively for

A and B

. The vapour pressure of pure

A

is ______

mm Hg

. (Nearest integer) Consider the liquids and solutions behave ideally

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 25 January 2023 Shift 1>Q 105

The osmotic pressure of solutions of PVC in cyclohexanone at $300 K$ are plotted on the graph. The molar mass of PVC is $g {mol}^{- 1}$ (Nearest integer)

Question Image

(Given : $R = 0.083 L atm K^{- 1} {mol}^{- 1}$ )

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.

Important Questions on Solutions

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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.