Question:
Find the correct statements related to group 15 hydrides:
A. Reducing nature increases from NH₃ to BiH₃
B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃
C. The stability of hydrides decreases from NH₃ to BiH₃
D. HEH bond angle decreases from NH₃ to SbH₃
Find the correct statements related to group 15 hydrides:
A. Reducing nature increases from NH₃ to BiH₃
B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃
C. The stability of hydrides decreases from NH₃ to BiH₃
D. HEH bond angle decreases from NH₃ to SbH₃
A. Reducing nature increases from NH₃ to BiH₃
B. Tendency to donate lone pair of electrons decreases from NH₃ to BiH₃
C. The stability of hydrides decreases from NH₃ to BiH₃
D. HEH bond angle decreases from NH₃ to SbH₃
Updated On: Apr 12, 2026
- A and B only
- B and C only
- A, B, C and D
- A, C and D Only
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
As we move down Group 15, the atomic size of the central atom increases, leading to longer and weaker $E-H$ bonds.
Step 2: Detailed Explanation:
A \& C: Bond dissociation enthalpy decreases down the group. Thus, thermal stability decreases and reducing nature (ability to give H) increases. (True)
B: As size increases, lone pair density decreases, making the central atom a weaker Lewis base. (True)
D: According to VSEPR/Drago's rule, as the electronegativity of the central atom decreases, the bond pairs move away, and lone pair repulsion pushes them closer, reducing the angle. (True)
Step 3: Final Answer:
All statements A, B, C, and D are correct.
As we move down Group 15, the atomic size of the central atom increases, leading to longer and weaker $E-H$ bonds.
Step 2: Detailed Explanation:
A \& C: Bond dissociation enthalpy decreases down the group. Thus, thermal stability decreases and reducing nature (ability to give H) increases. (True)
B: As size increases, lone pair density decreases, making the central atom a weaker Lewis base. (True)
D: According to VSEPR/Drago's rule, as the electronegativity of the central atom decreases, the bond pairs move away, and lone pair repulsion pushes them closer, reducing the angle. (True)
Step 3: Final Answer:
All statements A, B, C, and D are correct.
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