Question

Which of the following is combustible?

(a) Oxygen

(b) Carbon dioxide

(c) Hydrogen

(d) All of these​

Answer 1

Answer:

Explanation: Glass, iron nail and stone piece will not burn like wood hence they are not combustible. Wood burns in air and it is called the combustible substance.

Answer 2

(c) Hydrogen

1. Hydrogen is a combustible gas. Oxygen and Carbon Dioxide are non-combustible gases.

2. A combustible gas catches fire in the air while a non-combustible gas does not catch fire in the air.

3. During the combustion of Hydrogen, it reacts with the oxygen present in the air to produce water.

    $2H_{2} + O_{2} -------> 2H_{2} o$

Hence, the correct option is (c) Hydrogen.