Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere.

Reason R: Hydrogen is the lightest element.

In the light of the above statements, choose the correct Answer from the given below

• A. A is false but R is true
• B. Both A and R are true but R is NOT the correct explanation of A
• C. Both A and R are true and R is the correct explanation of A
• D. A is true but R is false

Answer 1

The correct option is C Both A and R are true and R is the correct explanation of A

Hydrogen is the most abundant element in the universe because all luminous bodies of the universe i.e. stars and nebulae are made up of hydrogen which acts as nuclear fuel and fusion reaction is responsible for their light. Hence the correct option is (b).