NEET 2025 — Chemistry solution

NEET2025Chemistry

Identify the correct orders against the property mentioned:

(A) H $_{2}$ O > NH $_{3}$ > CHCl $_{3}$ — dipole moment

(B) XeF $_{4}$ > XeO $_{3}$ > XeF $_{2}$ — number of lone pairs on central atom

(D) N $_{2}$ > O $_{2}$ > H $_{2}$ — bond enthalpy

Choose the correct answer from the options given below:

A
A, D only
B
B, D only
C
A, C only
D
B, C only

Solution

(A) Dipole moments (in D): H $_{2}$ O ≈ 1.85, NH $_{3}$ ≈ 1.47, CHCl $_{3}$ ≈ 1.04 → correct order. ✓

(B) Lone pairs on Xe: XeF $_{4}$ has 2 LP, XeO $_{3}$ has 1 LP, XeF $_{2}$ has 3 LP. So the correct order is XeF $_{2}$ > XeF $_{4}$ > XeO $_{3}$ , not as stated. ✗

(C) Bond lengths follow atomic size of the constituents. The correct order is N $-$ O > C $-$ H > O $-$ H actually — depends on individual single-bond lengths, but as stated O $-$ H > C $-$ H > N $-$ O is incorrect. ✗

(D) Bond enthalpies (kJ/mol): N $\equiv$ N ≈ 945, O=O ≈ 498, H $-$ H ≈ 436 → correct order. ✓

$∴$ A and D are correct.

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