Which of the following options is correct for the given statement:
The most abundant elements in the universe are
1. neon and argon
2. hydrogen and helium
3. aluminium and copper
4. oxygen and nitrogen

Q. The atoms of which of the following pair of elements are most likely to exist in free state ?
(a) hydrogen and helium
(b) argon and carbon
(c) neon and nitrogen
(d) helium and neon

Q. 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

Q.

Which is the lightest and the most abundant element in the universe?

Q. Hydrogen is the most abundant element in the universe.

Q.

Helium is the second most abundant element in the Universe. Yet, it is not the most abundant on Earth - Why?