In mining the two terms Blackdamp and Firedamp are used to denote two important gas situations that ...........

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In mining the two terms Blackdamp and Firedamp are used to denote two important gas situations that must be taken care of during mining operations. These gases are

1.Carbon dioxide

2.Carbon monoxide

3.Methane

4.Nitrogen Oxide

Select the correct answer using the codes below.

1 and 2 only

1 and 3 only

2 and 4 only

2 and 3 only

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Explanation:

Damps is the collective name given to all gases (other than air) found in coal mines in Great Britain.
Blackdamp is a mining term for a build-up of carbon dioxide. This gas is not poisonous, but because it replaces oxygen in the air, it means that people have nothing to breathe and can suffocate.
Carbon dioxide can form due to oxidation, where coal that is in contact with the air uses up the oxygen to produce carbon dioxide. It is not usually a problem when mine workings are well ventilated. It is heavier than air, so will lie in lower areas of a mine or in old, disused roadways.

Firedamp is flammable gas found in coal mines. It is the name given to a number of flammable gases, especially methane.
It is particularly found in areas where the coal is bituminous. The gas accumulates in pockets in the coal and adjacent strata, and when they are penetrated, the release can trigger explosions