We get 2 2 CaH PO or 4 2 4 Calcium hypophosphite CaH P O and 3 Phosphine PH 4 2 4 CaH P O X → 4 2 4 2 4 3 2 2 3 6 3 2 Calcium Phosphine hypophosphite P Ca OH H O CaH P O PH → Since the size of nitrogen is smaller than the size of phosphorous, the bond pairs of electrons I NH₃ experiences more repulsion compared to the bond pairs of electrons of PH₃. This repulsion is the reason the bond angle in PH₃ i.e. X is less Than the bond angle in ammonia. Hence option 21(b) is the correct one.
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