If pressure is in atmosphere and volume in dm³ , then the unit of 'a' is-

1. $\mathrm{atm}$ ${\mathrm{dm}}^6$ ${\mathrm{mol}}^{-2}$

2. $\mathrm{atm}$ ${\mathrm{dm}}^4$ ${\mathrm{mol}}^{-2}$

3. $\mathrm{atm}$ ${\mathrm{dm}}^3$ ${\mathrm{mol}}^{-3}$

4. ${\mathrm{atm}}^{-1}$ ${\mathrm{dm}}^4$ ${\mathrm{mol}}^{-2}$

If 1 g of each of the following gases are taken at STP, then the gas that will have the highest volume is -

$\mathrm{CO},$ ${\mathrm{H}}_2\mathrm{O},$ ${\mathrm{CH}}_4,$ $\mathrm{NO}$

1. CH₄

2.  H₂O

3. NO 

4. CO

The pressure of 1 gm of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar.

The correct relationship between their molecular masses is -

1. M_A=M_B

2. 4M_A=M_B

3. M_A= 2M_B

4. 2M_A=M_B

At 0^°C, the density of a certain oxide of a gas at 2 bar is the same as that of dinitrogen at 5 bar.

The molecular mass of the oxide would be -

1. 35 g/mol

2. 45 g/mol

3. 70 g/mol

4. 60 g/mol

The volume of H₂ that would be released when 0.15 g of aluminium reacts at 20 °C and 1 bar pressure with caustic soda is-

1. 225 L

2. 301 mL

3. 156 L

4. 203 mL

The pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm³ flask at 27 °C would be -

$1.$ $8.31$ $\times$ ${10}^4$ $\mathrm{Pa}$
$2.$ $7.43$ $\times$ ${10}^{-4}$ $\mathrm{Pa}$
$3.$ $6.87$ $\times$ ${10}^3$ $\mathrm{Pa}$
$4.$ $8.31$ $\times$ ${10}^6$ $\mathrm{Pa}$

A 200 mL flask having oxygen at 220 mm and a 300 mL flask having nitrogen at 100 mm are connected in such a way that ${\mathrm{O}}_2 \mathrm{and} {\mathrm{N}}_2$ may combine in their volumes if temperature is kept constant. The total pressure of the gaseous mixture is-

1. 158 mm

2. 138 mm

3. 148 mm

4. 168 mm

The partial pressure of oxygen in a flask containing 16 g ${\mathrm{O}}_2$ and 32 g ${\mathrm{SO}}_2$ is-

1. 1/16 of total pressure

2. 1/2 of total pressure

3. 2/3 of total pressure

4. None of the above

Equal weights of ethane and hydrogen gas are mixed in an empty container at $25°\mathrm{C}$. The fraction of total pressure exerted by hydrogen is-

1. 1: 2

2. 1: 1

3. 1: 16

4. 15: 16

The compressibility factor of a gas is less than unity at STP. The correct statement among the following is -

1. ${\mathrm{V}}_{\mathrm{m}}$  > 22.4 L

2. ${\mathrm{V}}_{\mathrm{m}}$ < 22.4 L

3. ${\mathrm{V}}_{\mathrm{m}}$ = 22.4 L

4. ${\mathrm{V}}_{\mathrm{m}}$ = 44.8 L