JEE Main 2022 · 29 Jun · Shift 2 · Chemistry Q66

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ChemistrySingle correct+4 / -1Question 66 of 90

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

Assertion A: The first ionization enthalpy for oxygen is lower than that of nitrogen.

Reason R: The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion.

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

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

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

A is correct but R is not correct.

A is not correct but R is correct.

Answer and worked solution

Official answer: A

Oxygen ( $2p^4$ ) has one doubly occupied 2p orbital; the extra repulsion makes it easier to remove an electron than from nitrogen's half-filled $2p^3$ . NTA's key takes R as the explanation.

(A)

Topics:Ionisation enthalpy

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JEE Main 2022 · 29 Jun · Shift 2, Chemistry question 66