Q44 of 141 Page 14

How is petroleum gas obtained? Name the gas that is its main constituent.

Petroleum gas is obtained as a by-product in oil refineries from the fractional distillation of petroleum. It is also produced by the cracking of petrol. The main constituent of petroleum gas is butane.

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42 Give two examples of fossil fuels. 43 Name any three varieties of coal found in nature. 45 Name any two components obtained by fractional distillation of petroleum that are not used as a fuel. 46 Write the full name for LPG and CNG.