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

0.5 L of H₂ at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C.

The pressure inside the vessel would be -

1. 3.6 bar

2. 1.8 bar

3. 4.1 bar

4. 0.7 bar

A student forgot to add the reaction mixture to the round-bottomed flask at 27 °C but instead, he placed the flask on the flame. After a lapse of time, he realized his mistake and using a pyrometer he found the temperature of the flask was 477 °C. The fraction of air that would  expel out would be :

1. 1/3

2. 4/5

3. 3/5

4. 2/3

The density of a gas is found to be 5.46 g/dm³ at 27^°C at 2 bar pressure. The density of gas at STP would be -

$1. 2.0 \mathrm{g} {\mathrm{dm}}^{-3}$
$2. 3.0 \mathrm{g} {\mathrm{dm}}^{-3}$
$3. 4.5 \mathrm{g} {\mathrm{dm}}^{-3}$
$4. 1.5 \mathrm{g} {\mathrm{dm}}^{-3}$

As per Charles's law ,–273° C is the lowest possible temperature because:

The minimum pressure required to compress 500 dm³ of air at 1 bar to 200 dm³ at 30°C is :

1. 3.6 bar

2. 3.2 kbar

3. 2.5 bar

4. 2.8 kbar