p-Block elementsHard

Question

Which of the following statements is (are) correct ?

Options

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 NH3 to BiH3
D.The reducting power increases in going from NH3 to BiH3

Solution

All acts as reducing agent and the increasing order of reducing character is NH3 < PH3 < AsH3 < BiH3 on account  of decreasing M - H bond dissociation energies with increasing size of  central atoms. NH3 is only a mild reducing agent.

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