JEE PYQ: Hydrogen Question 5
Question 5 - 2021 (24 Feb Shift 2)
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 and R is the correct explanation of A (c) A is true but R is false (d) Both A and R are true but R is NOT the correct explanation of A
Show Answer
Answer: (b)
Solution
Hydrogen is the most abundant element in the universe because all luminous bodies (stars & nebulae) are made up of hydrogen. Being the lightest element, hydrogen escapes Earth’s gravity easily, so it is not abundant in the troposphere.
BETA
