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JEE Main

IMPORTANT

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In a solvent $50 %$ of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____ $\times 10^{- 2}$ (Round off to the nearest integer)

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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 - 27 July 2021 Shift 1>Q 41

The density of

NaOH

solution is

1.2 g {cm}^{- 3} .

The molality of this solution is

m

(Round off to the Nearest Integer):
[Use : Atomic masses :

Na : 23.0 u O : 16.0 u

H : 1.0 u

Density of

H_{2} O : 1.0 g {cm}^{- 3}]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 27 August 2021 Shift 2>Q 42

100 g

of propane is completely reacted with

1000 g

of oxygen. The mole fraction of carbon dioxide in the resulting mixture is

x \times 10^{- 2}

. The value of

x

is (Nearest integer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 27 August 2021 Shift 2>Q 43

40 g

of glucose (Molar mass

= 180)

is mixed with

200 mL

of water. The freezing point of solution is

__K

. (Nearest integer)
[Given :

K_{f} = 1.86 K kg {mol}^{- 1};

Density of water

= 1.00 g {cm}^{- 3};

Freezing point of water

= 273.15 K]

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 27 August 2021 Shift 1>Q 44

1 kg

0.75

molal aqueous solution of sucrose can be cooled up to

- 4 ° C

before freezing. The amount of ice (in

g

) that will be separated out is ___________. (Nearest integer) [Given :

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

]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 Feb 2021 Shift 2>Q 45

When

12.2 g

of benzoic acid is dissolved in

100 g

of water, the freezing point of solution was found to be

- 0.93 ° C (K_{f} (H_{2} O) = 1.86 K kg {mol}^{- 1})

. The number

(n)

of benzoic acid molecules associated (assuming

100 %

association) is _.

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 Feb 2021 Shift 1>Q 46

224 mL

{SO}_{2 (g)}

298 K

and

1 atm

is passed through

100 mL

0.1 M NaOH

solution. The non-volatile solute produced is dissolved in

36 g

of water. The lowering of vapour pressure of solution (assuming the solution is dilute) (

P °_{(H_{2} O)} = 24 mm

Hg

) is

x \times 10^{- 2} mm

Hg

the value of

x

is (Integer answer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 August 2021 Shift 2>Q 47

83 g

of ethylene glycol dissolved in

625 g

of water. The freezing point of the solution is ..... K. (Nearest integer)
[Use : Molal Freezing point depression constant of water

= 1.86 K kg {mol}^{- 1}

Freezing point of water

= 273 K

Atomic masses :

C : 12.0 u, O : 16.0 u, H : 1.0 u]

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 8 - Solutions>JEE Main - 26 August 2021 Shift 2>Q 48

100 mL

{Na}_{3} {PO}_{4}

solution contains

3.45 g

of sodium. The molarity of the solution is .....

\times 10^{- 2} mol L^{- 1}

. (Nearest integer)
[Atomic Masses -

Na : 23.0 u, O : 16.0 u, P : 31.0 u]

In a solvent 50% of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____×10-2 (Round off to the nearest integer)

Important Questions on Solutions

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In a solvent $50 %$ of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is _____ $\times 10^{- 2}$ (Round off to the nearest integer)