Question

8. Assertion (A): Many fuel gases contain hydrogen as a major constituent.

Reason (R): Liquid hydrogen is a very light fuel.

• A. Both (A) and (R) are true and (R) is the correct explanation for (A).
• B. Both (A) and (R) are true but (R) is not the correct explanation for (A).
• C. (A) is correct but (R) is false
• D. (A) is false but (R) is true.

Answer 1

The correct option is B

Both (A) and (R) are true but (R) is not the correct explanation for (A).

Explanation for Assertion statement:

• Fuels such as water gas, coal gas, semi-water gas, etc. contain hydrogen $\left({\mathrm{H}}_2\right)$ as a major constituent.
• Hydrogen has a high heat of combustion and high calorific value due to this reason, it is a major component and is used as a fuel.

Explanation for Reason statement:

• Liquid hydrogen is used as a fuel and is very light.

Hence, option (B) is correct answer. Both (A) and (R) are true but (R) is not the correct explanation for (A).