Coal and Petrol...

The zone of flame which consists of hot, unburnt  vapours of the combustible material is:

Product formed after complete combustion of methane is:

Highly inflammable substances:

Which one among the following is not an inexhaustible natural resource

Product obtained by burning coal in the presence of air is:

A useful product of destructive distillation of coal which is used in making drugs and photographic materials is;

Petroleum separates into different fractions on the basis of difference in their:

Which one among the following is used as a fuel for jet air planes?

The colour of flame produced by the fuel in the sufficient supply of oxygen is:

Unit of calorific value of a fuel is: