A) [A] on heating gives (X) and \[{{O}_{2}}\].
B) The bond angle in (X) is less than that in case of ammonia.
C) [A] is a dibasic acid.
D) (X) is more basic than ammonia.
Correct Answer: B
Solution :
[b]: \[8P+3Ca{{(OH)}_{2}}+6{{H}_{2}}O\to \] \[3Ca{{({{H}_{2}}P{{O}_{2}})}_{2}}+\underset{(X)}{\mathop{2P{{H}_{3}}}}\,\] [A] is \[{{H}_{3}}P{{O}_{2}}\]. (hypophosphorous acid), a monobasic acid \[P{{H}_{3}}\]is less basic than \[N{{H}_{3}}\]. The bond angle in (X) is less than that present in \[N{{H}_{3}}.{{H}_{3}}P{{O}_{2}}\]on heating gives orthophosphoric acid and phosphine (X).
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