NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 32

MEDIUM

12th West Bengal Board

IMPORTANT

Earn 100

A $4$ percent solution of sucrose $(C_{12} H_{22} O_{11})$ is isotonic with $3$ percent solution of an unknown organic substance. Calculate the molecular weight of the unknown substance.

Important Questions on Solutions

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 33

The given aqueous solution of a protein contains

1.26 g

of the protein in

200 {cm}^{3}

solution. The osmotic pressure of this solution at

300 K

is found to be

2.57 \times 10^{- 3} bar .

Calculate the molar mass of the protein.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 34

0.6 mL

of acetic acid

({CH}_{3} COOH),

having density

1.06 g {mL}^{- 1},

is dissolved in

1

litre of water. The depression in freezing point observed for this strength of acid was

0.0205 ° C .

Calculate the van't Hoff factor and the dissociation constant of acid.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 35

Calculate the b.pt. of

1

molar aqueous solution of

KBr .

Given that the density of solution is

1.06 g {mL}^{-}, K_{b}

for water is

0.52 K kg {mol}^{-} .

[Atomic mass of

K = 39, Br = 80

]

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 36

3.100 g

of

{BaCl}_{2}

in

250 g

of water boils at

100.83 ° C .

Calculate the value of van't Hoff factor and molality of

{BaCl}_{2}

in this solution. (

K_{b}

for water

= 0.52 K m^{- 1},

molar mass of

{BaCl}_{2} = 208.3 g {mol}^{- 1}

).

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 37

0.01 m

aqueous solution of

K_{3} [Fe {(CN)}_{6}]

freezes at

- 0.062 ° C .

What is the apparent percentage of dissociation ? (

K_{f}

for water

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

)

EASY

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 1

When a solute is dissolved in a solvent, the vapour pressure of the solution_____.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2

If the vapour pressure at a particular composition of two liquids is the lowest, then its boiling point must be _____.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 4

The osmotic pressure

(π)

of a solution

= CR \times

_____.