All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 57

MEDIUM

12th ICSE

IMPORTANT

Earn 100

What mass of $NaCl$ must be dissolved in $65.0 g$ of water to lower the freezing point of water by $7.50 ° C$ ? The freezing point depression constant for water is $1.86 ° C Kg {mol}^{- 1}$ . Assume Van't Hoff factor of $NaCl$ is $1.87$ . (Molar mass of $NaCl = 58.5 g {mol}^{- 1}$ )

Important Questions on Solutions

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 58

Why does a solution of chloroform and acetone show negative deviation from Raoult's law?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 58

State how the vapour pressure of a solvent is affected, when a non-volatile solute is dissolved in it?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 58

A solution of glucose

(C_{6} H_{12} O_{6})

in water is labeled as

10 %

by weight. What would be the molality of the solution? ( Molar mass of glucose

= 180 g {mol}^{- 1}

)

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 59

Two liquids

X

and

Y

boil at

100 ° C

and

120 ° C

respectively. Which of them has a higher vapour pressure at

50 ° C

and why?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 59

Calculate the boiling point of a solution prepared by adding

15.00 g

of

NaCl

to

250 g

water. (

K_{b}

for water

= 0.512 K Kg {mol}^{- 1}

, molar mass of

NaCl = 58.44 g

)

MEDIUM

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 59

Calculate the lowering of vapour pressure for an aqueous solution of non-electrolyte at

75 ° C

. (

∆ H = 9.720 K cal {mol}^{- 1}, p_{2} = 742.96 torr

)

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 60

What is Van't Hoff factor?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 2 - Solutions>Chapter Practice>Q 60

What possible value can it have if the solute molecules undergo dissociation?