ICSE Class 10 Answered

1) 

Given:

Volume of O₂ V_O2 = 20 ml

Volume of H₂ V_H2 = 20 ml

Volume of CO V_CO = 10 ml

Oxygen and hydrogen are exploded in an enclosure;

2H₂ + O₂ → 2H₂O  ......(1)

Oxygen and carbon monoxide are exploded in an enclosure;

2CO + O₂ → 2CO₂ ........(2)

From Eq (1) 

2 V of H₂ reacts with 1 V of the O₂.

Therefore, 20 ml of H₂ reacts with 10 ml of O₂.

So, 20- 20 = 10 ml of O₂ remains unreacted.

From Eq (2) 

2 V of CO reacts with 1 vol of O₂ 

Therefore, 10 ml of CO reacts with 5 ml of  O₂ and gives 10 ml of CO₂ 

So, from 10 ml of O₂ 10-5 = 5 ml remains unreacted.

The total composition of the resulting mixture is 5 ml O₂ and 10 ml CO₂.

2)