Question

The main constituent of CNG is ______.

• A. Ethane
• B. Methane
• C. Propane
• D. Butane

Answer 1

The correct option is B

Methane

Explanation for correct option:

(B) Methane.

• The CNG is nothing but Compressed Natural Gas.
• It is a colourless, odourless and tasteless gas.
• It contains chiefly $93.05\%$ methane, nitrogen, carbon dioxide, propane and traces of ethane.
• It is mainly made up of methane which is compressed to less than $1\%$ at standard atmospheric pressure.
• It is a fuel gas made of petrol and others.
• It is stored in a container of pressure $20-25\mathrm{Mpa}$.
• It is mainly used as a fuel for trucks, buses and cars.

Explanation for incorrect option:

(A) Ethane.

• CNG only contains a trace amount of ethane. So, it is an incorrect option.

(C) Propane.

• CNG contains propane in smaller amounts, not as a major one. So, this is an incorrect option.

(D) Butane.

• CNG does not contain butane in an amount. So it is an incorrect option.

Therefore, the correct option is (B) Methane.