JEE Main 2026 Apr 8 Shift 2, Chemistry Q9: Group 15 Elements: The Nitrogen Family

JEE Main2026Apr 8, Shift 2Chemistry

Find the correct statements related to group 15 hydrides.

A. Reducing nature increases from NH $_{3}$ to BiH $_{3}$ .

B. Tendency to donate lone pair of electrons decreases from NH $_{3}$ to BiH $_{3}$ .

C. The stability of hydrides decreases from NH $_{3}$ to BiH $_{3}$ .

D. H–E–H bond angle decreases from NH $_{3}$ to SbH $_{3}$ ( $E$ = Elements of group 15).

Choose the correct answer from the options given below :

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

Solution

Track the down-group trends in group 15 hydrides EH $_{3}$ .

A. True. Bond dissociation energy of E–H falls down the group, so the H atom is released more easily, making reducing power increase: NH $_{3} <$ PH $_{3} <$ AsH $_{3} <$ SbH $_{3} <$ BiH $_{3}$ .

B. True. The lone-pair-donating tendency (basicity, Lewis basicity) drops as the central atom gets larger and the lone pair becomes more diffuse: NH $_{3} >$ PH $_{3} >$ AsH $_{3} >$ SbH $_{3} >$ BiH $_{3}$ .

C. True. Thermal stability follows the E–H bond strength, which decreases down the group.

D. True. As the central atom grows, the lone-pair–bond-pair repulsion increasingly pushes the bonded H atoms together; the bond angle shrinks: $10 7^{\circ}$ (N) $\to 93. 5^{\circ}$ (P) $\to 91. 8^{\circ}$ (As) $\to 91. 3^{\circ}$ (Sb).

All four statements are correct.

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JEE Main 2026 Apr 8 Shift 2, Chemistry Q9: Group 15 Elements: The Nitrogen Family

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