(A) . In group $15$ hydrides,the bond angle decreases down the group as the electronegativity of the central atom decreases. The bond angle order is $

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(A) . In group $15$ hydrides,the bond angle decreases down the group as the electronegativity of the central atom decreases. The bond angle order is $NH_3 (107.8^{\circ}) > PH_3 (93.6^{\circ}) > AsH_3 (91.8^{\circ}) > SbH_3 (91.3^{\circ}) > BiH_3 (90^{\circ})$. Therefore,the bond angle in $PH_3$ is much less than in $NH_3$.