If 300 ml of a gas at 27°C is cooled to 7°C at constant pressure, its final volume will be:

1.	135 ml	2.	540 ml
3.	350 ml	4.	280 ml

A flask containing air (open to atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is nearly- 

1. 16.6

2. 40

3. 66

4. 20

A sealed tube which can withstand a pressure of 3 atmosphere is filled with air at ${27}^{o}C$ and 760 mm pressure. The tube will burst at - 

1. 900°C

2. 627°C

3. 726°C

4. 1173°C

The number of moles of H₂ in 0.224 litre of hydrogen gas at STP (273 K, 1 atm.) is-

1. 1

2. 0.1

3. 0.01

4. 0.001

120 g of an ideal gas of molecular weight 40 g mole^–1 are confined to a volume of 20 L at 400 K. The pressure of the gas is- 

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

1. 3.90 atm

2. 4.92 atm

3. 6.02 atm

4. 2.96 atm

The volume of 2.8 g of carbon monoxide at 27°C and 0.821 atm pressure is- 

$(\mathrm{R}=0.0821$ $\mathrm{lit}$ $\mathrm{atm}$ ${\mathrm{K}}^{-1}$ ${\mathrm{mol}}^{-1})$

1. 0.3 litre

2. 1.5 litre

3. 3 litre

4. 30 litre

3.2 g of oxygen  and 0.2 g of hydrogen are placed in a 1.12 litre flask at 0°C.

The total pressure of the gas mixture will be-

1. 1 atm

2. 4 atm

3. 3 atm

4. 2 atm

The density of methane at 2.0 atmosphere pressure and 27°C is- 

1. 0.13 gL^–1

2. 0.26 gL^–1

3. 1.30 gL^–1

4. 2.60 gL^–1

The volume of 0.0168 mol of O₂ obtained by decomposition of KClO₃ and collected by displacement of water is 428 ml at a pressure of 754 mm Hg at 25°C. The pressure of water vapour at 25°C is- 

1. 18 mm Hg

2. 20 mm Hg

3. 22 mm Hg

4. 24 mm Hg

The partial pressure of H₂ in a flask containing 2 g of H₂, 14 g of N_2, and 16 g of O₂ is-

1. 1/2 of the total pressure

2. 1/3 of the total pressure

3. 1/4 of the total pressure

4. 1/16 of the total pressure