JEE Main 2026 — Jan 28, Shift 1 — Chemistry solution

JEE Main2026Jan 28, Shift 1Chemistry

Regarding the hydrides of group 15 elements EH $_{3}$ (E = N, P, As, Sb), select the correct statement from the following:

A. The stability of hydrides decreases down the group.

B. The basicity of hydrides decreases down the group.

C. The reducing character increases down the group.

D. The boiling point increases down the group.

Choose the correct answer from the options given below:

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

Solution

Trends for EH $_{3}$ (E = N, P, As, Sb, Bi):

A. Thermal stability: NH $_{3} >$ PH $_{3} >$ AsH $_{3} >$ SbH $_{3} >$ BiH $_{3}$ — decreases. Correct.

B. Basicity: NH $_{3} >$ PH $_{3} >$ AsH $_{3} >$ SbH $_{3} >$ BiH $_{3}$ — decreases (lone pair becomes more diffuse). Correct.

C. Reducing power: increases down the group as E-H bond weakens. Correct.

D. Boiling point trend: NH $_{3}$ has anomalously high b.p. due to H-bonding; PH $_{3}$ is the lowest, then b.p. rises through AsH $_{3}$ , SbH $_{3}$ , BiH $_{3}$ . The trend is not monotonically increasing, so the statement as written is incorrect.

$∴$ Only A, B and C. Option (1).

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