Question

What type of combustion is represented by:
(a) burning of white phosphorus in air at room temperature?
(b) burning of LPG in a gas stove?
(c) ignition of a cracker?
(d) burning of coal dust in a coalmine?

Answer 1

Answer:

(a) spontaneous combustion

(b) fast combustion

(c)explosive combustion

(d) slow combustion

Answer 2

Spontaneous, rapid, explosive, spontaneous

Explanation:

(a) burning of white phosphorus in air at room temperature - spontaneous combustion.

Spontaneous combustion is the phenomenon in which a substance unexpectedly bursts into flame without apparent cause.

(b) burning of LPG in a gas stove - rapid combustion.

The combustion in which the gas burns rapidly and produces heat and light is called rapid combustion.

(c) ignition of a cracker - explosive combustion.

A very fast combustion reaction in which a large amount of heat,light and sound are produced is called explosive combustion.

(d) burning of coal dust in a coalmine - spontaneous combustion.