Verified Solution • 2025–26 Session
moderate
QJEEM21Chb557: JEE Main 2021 Chemistry - Class 11 JEEM21Chb557 Solution: Given below are two statements : one is labelled as Assertion A …
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 options given below :
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 options given below :
Multiple Choice Options
- A Both A and R are true but R is NOT the correct explanation of A
- B Both A and R are true and R is the correct explanation of A
- C A is true but R is false
- D A is false but R is true.
Step-by-Step Verified Solution
As we know, hydrogen is most abundant element in the universe but the most abundant gas in the troposphere is nitrogen, because hydrogen is lightest element.
Troposphere contains 3 quarters of mass of the entire atmosphere. The air here contain 78% nitrogen and 21% oxygen. The last 1% is made of argon, water vapour and carbon dioxide.