Question

Which of the following statements is (are) correct ?
A. The hydrides of group `15` elements act as oxidising agents
B. The hydrides of group `15` elements act as reducing agents
C. The oxidising power increases in going from `NH_(3)` "to" `BiH_(3)`
D. The reduciing power increases in going from `NH_(3)` "to" `BiH_(3)`

Answer 1

Correct Answer - BD
All acts as reducing agent and the increasing order of reducing character is `NH_(3) lt PH_(3) lt AsH_(3) lt BiH_(3)` on account of decreasing M-H bond dissociation energies with increasing size of central atoms. `NH_(3)` only a mild reducing agent.