JEE Main 2022 · 27 Jul · Shift 1 · Chemistry Q63

ChemistrySingle correct+4 / -1Question 63 of 90

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

Assertion A: Energy of 2s orbital of hydrogen atom is greater than that of 2s orbital of lithium.

Reason R: Energies of the orbitals in the same subshell decrease with increase in the atomic number.

In the light of the above statements, choose the correct answer from the options given below.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is NOT the correct explanation of A.

A is true but R is false.

A is false but R is true.

Answer and worked solution

Official answer: A

Assertion. Hydrogen's 2s ( $-3.4$ eV) lies above lithium's 2s, which feels a larger nuclear charge. True.

Reason. Orbital energies in a given subshell fall as Z rises. True, and it explains A.

(A)

Topics:Bohr model

JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 63