Choose the correct statements about the hydri | vedclass

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(C) On moving down the group $15$,the atomic size of the central atom increases,which leads to a decrease in the $M-H$ bond dissociation enthalpy.$1$.

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$A$ and $B$ only

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(C) On moving down the group $15$,the atomic size of the central atom increases,which leads to a decrease in the $M-H$ bond dissociation enthalpy.$1$. Thermal stability decreases as the bond strength decreases,so the order is $NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3$. Thus,statement $A$ is correct.$2$. Reducing character increases as the bond strength decreases,making it easier to release hydrogen. The order is $NH_3 $3$. Statement $C$ is incorrect because $NH_3$ is the weakest reducing agent,while $BiH_3$ is the strongest.$4$. Statement $D$ is incorrect because basicity decreases down the group due to the increase in the size of the central atom and the dispersion of the lone pair over a larger volume. The order is $NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3$.Therefore,statements $A$ and $B$ are correct.

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