The strongest base is

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(A) The correct answer is $(A)$. In the group $15$ hydrides ($NH_3$ to $SbH_3$),the basic strength decreases down the group. This is because the lone

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$NH_3$

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(A) The correct answer is $(A)$. In the group $15$ hydrides ($NH_3$ to $SbH_3$),the basic strength decreases down the group. This is because the lone pair on the central atom is present in a larger orbital as the size of the central atom increases. In $NH_3$,the lone pair is in a smaller $sp^3$ hybridized orbital,making it more concentrated and easily available for donation compared to the larger atoms in $PH_3$,$AsH_3$,and $SbH_3$.

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