Which of the following statements are true?
1. LPG, matchstick, coal, and petrol are the examples of combustible substances.
2. Substances that have a higher ignition temperature than room temperature undergo spontaneous combustion.
3. Burning of kerosene is an example of rapid combustion.
4. Carbon monoxide is produced during complete combustion of coal.

1 and 3

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1, 2, and 3

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2, 3, and 5

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3 and 4

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Solution

The correct option is A 1 and 3
1. Combustible substances are the substances that can undergo combustion. Since, LPG, matchstick, coal, and petrol are capable of undergoing combustion, they are examples of combustible substances.

2. Spontaneous combustion takes place when a fuel gets ignited on its own without an external heat source. This is because the ignition temperature of the fuel is less than the room teperature.

3. Rapid combustion takes place when a fuel burns rapidly on supplying heat. Kerosene is an inflammable substance and undergoes rapid combustion.

4. On complete combustion of coal, carbon dioxide gas is produced.

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Similar questions

Name one substance which undergoes spontaneous combustion (or burns in air at room temperature).

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 ?

(d) burning of coal dust in a coal mine ?

If ignition temperature of a substance is lower than room temperature then it will undergo spontaneous combustion.

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