Choose the correct statements regarding hydrides of Group 15.
A. Reducing power increases down the group.
B. Basic nature increases down the group.
C. Stability decreases down the group.
D. Boiling point decreases regularly down the group.
Solution:
Statement A:
Bond strength decreases down the group. Hydrides release hydrogen more easily. Reducing power increases.
A is correct.
Statement B:
Basic character decreases down the group:
NH3 > PH3 > AsH3 > SbH3 > BiH3
B is incorrect.
Statement C:
Thermal stability decreases down the group.
C is correct.
Statement D:
Boiling point does not decrease regularly. After NH3, boiling point generally increases due to increasing molecular mass.
D is incorrect.
Answer:
A and C only (Option 3)