JEE Main 2026 — Jan 24, Shift 1 — Chemistry solution

JEE Main2026Jan 24, Shift 1Chemistry

Given below are statements about some molecules/ions.

Identify the CORRECT statements.

A. The dipole moment value of $N F_{3}$ is higher than that of $N H_{3}$ .

B. The dipole moment value of $B e H_{2}$ is zero.

C. The bond order of $O_{2}^{2 -}$ and $F_{2}$ is same.

D. The formal charge on the central oxygen atom of ozone is $- 1$ .

E. In $N O_{2}$ , all the three atoms satisfy the octet rule, hence it is very stable.

Choose the correct answer from the options given below :

A
A, B, C, D & E
B
B & C only
C
B, C & D only
D
A, C & D only

Solution

A. In $N H_{3}$ , the N–H bond dipoles and the lone-pair dipole point in the same direction, giving a large net moment. In $N F_{3}$ , the lone-pair dipole and the N–F bond dipoles partially cancel. Hence $μ (N H_{3}) > μ (N F_{3})$ . Incorrect.

B. $B e H_{2}$ is $s p$ -hybridised and linear; the two Be–H dipoles are equal and opposite, so $μ = 0$ . Correct.

C. $O_{2}^{2 -}$ : bond order $= (8 - 6) /2 = 1$ . $F_{2}$ : bond order $= (8 - 6) /2 = 1$ . Same. Correct.

D. Central oxygen in $O_{3}$ carries formal charge $+ 1$ , not $- 1$ . Incorrect.

E. $N O_{2}$ is an odd-electron molecule (17 valence electrons); nitrogen does not complete its octet. Incorrect.

$∴$ Only B and C are correct.

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