Question

Choose the correct option.
1. Which of the following conditions is not necessary for combustion?
a)presence of a combustible substance
b)presence of oxygen
c) presence of nitrogen
d) attainment of ignition temperature​

Answer 1

Answer:

Combustion is a chemical reaction in which a combustible or flammable substance reacts with a gas (which is a supporter of combustion, for example oxygen), releasing heat. The reaction is exothermic in nature. Necessary factors required for a combustion reaction to take place are :

1. A combustible or flammable substance. For example wood, petroleum, etc.

2. Ignition temperature. The fuel must be at or above this 'ignition temperature'.

3. A gas that is a supporter of combustion (oxygen). An abundant supply of such a gas is required.

Therefore Nitrogen in not Required

Answer 2

Answer:

Present of nitrogen is not available