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Free CBSE - Class 12 Chemistry - Solutions worksheets

Sample Worksheets

Here is a Sample Worksheet for you to Practice. Download this worksheet to see the answers.

1.

Gas

KH/k bar

Ar

40.3

CO2

1.67

HCHO

1.83 × 10−5

CH4

0.413

where KH is Henry's Law constant in water. The order of their solubility in water is :

1.
  • HCHO < CH4< CO2 < Ar
2.
  • Ar < CO2< CH4 < HCHO
3.
  • Ar < CH4< CO2 < HCHO
4.
  • HCHO < CO2< CH4 < Ar
2.

Which amongst the following aqueous solution of electrolytes will have minimum elevation in boiling point? Choose the correct option:

1.

0.05 M NaCl

2.

0.1 M KCl

3.

0.1 M MgSO4

4.

1 M NaCl

3.

The Henry's law constant (KH) values of three gases (A,B,C) in water are 145, 2×10−5 and 35 kbar respectively. The solubility of these gases in water follows the order:

1.

B > A > C

2.

B > C > A

3.

A > C > B

4.

A > B > C

4.
Determine the osmotic pressure of a solution prepared by dissolving 25 mg of \(K_{2}SO_{4}\) in 2 litre of water at 25° C, assuming that it is completely dissociated.
5.
Henry’s law constant for the molality of methane in benzene at 298 K is \(4.27 \times 10^{5}\) mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.
6.
100 g of liquid A (molar mass 140 g \(mol^{-1}\)) was dissolved in 1000 g of liquid B (molar mass 180 g \(mol^{-1}\)). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 Torr.
7.

Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot \(p_{total}\), \(p_{chloroform}\), and \(p_{acetone}\) as a function of \(x_{acetone}\). The experimental data observed for different compositions of mixture is: 

Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.

8.
Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene.
9.
The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen at 298 K are \(3.30 \times 10^{7}\) mm and \(6.51 \times 10^{7}\) mm respectively, calculate the composition of these gases in water.
10.
Determine the amount of \(CaCl_{2}\) (\(i\) = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27° C.
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