ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.66

MEDIUM

12th ICSE

IMPORTANT

Earn 100

Find the molality of a water solution which freezes at $263.15 K$ . ( $K_{f}$ of water $= 1.86 K kg {mol}^{- 1}$ )

Important Questions on Solutions

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.67

In a cold climate, water gets frozen causing damage to the car. Ethylene glycol is used as an antifreeze. Calculate the amount of ethylene glycol to be added to

4 kg

of water to prevent it from freezing at

- 6 ° C

. (

K_{f}

for water

= 1.85 K kg {mol}^{- 1}

)

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.68

The molal freezing point constant of benzene is

4.90

and its melting point is

5.51 ° C

. A solution of

0.816 g

of a compound A when dissolved in

7.5 g

of benzene freezes at

1.59 ° C

. Determine the molecular weight of A.

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.69

The latent heat of fusion of benzene is

30.25 cal / g

.

0.0802 g

of a substance when dissolved

13.03 g

of benzene lower the freezing point by

0.490 ° C

. If pure benzene freezes at

5.4 ° C

, calculate the molecular mass of the substance.

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.7

Calculate the osmotic pressure of

0.01 M

solution of cane sugar at

27 ° C

.

(R = 0.0821 L atm K^{- 1} {mol}^{- 1})

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.71

Calculate the concentration of a solution of glucose which is isotonic at the same temperature with a solution of urea containing

6.2 g / L

.

HARD

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.72

Osmotic pressure of a solution containing

7.0 g

of a protein in

100 mL

of solution is

20 mm Hg

at

37 ° C

. Calculate the molecular mass of the protein.

(R = 0.0821 L atm K^{- 1} {mol}^{- 1})

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.73

Calculate the freezing point of an aqueous solution of a non-electrolyte having osmotic pressure of

2.0 atm

at

300 K

.

(K_{f} = 1.86 K kg {mol}^{- 1}, R = 0.0821 L atm K^{- 1} {mol}^{- 1})

MEDIUM

12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>REVIEW EXERCISES>Q 2.74

A solution of sucrose (mol.wt.

342

) is prepared by dissolving

68.4 g

of it per litre of solution. What is the osmotic pressure at

300 K

?

(R = 8.314 k Pa {dm}^{3} K^{- 1} {mol}^{- 1})