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(A) $I$. The reducing property of $VA$ group hydrides increases from $NH_3$ to $BiH_3$ due to the decrease in bond dissociation enthalpy $(NH_3 < PH_3

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$I, II, III$ and $IV$

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(A) $I$. The reducing property of $VA$ group hydrides increases from $NH_3$ to $BiH_3$ due to the decrease in bond dissociation enthalpy $(NH_3 $II$. The tendency to donate a lone pair (basic strength) decreases from $NH_3$ to $BiH_3$ because the electron density on the central atom decreases as the size of the central atom increases.$III$. Thermal stability of $VA$ group hydrides decreases from $NH_3$ to $BiH_3$ as the $M-H$ bond length increases and bond strength decreases $(NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3)$.$IV$. Bond angle of $VA$ group hydrides decreases from $NH_3$ to $BiH_3$ due to the decrease in electronegativity of the central atom,which leads to more $p$-character in the bonding orbitals $(NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3)$.All statements $I, II, III,$ and $IV$ are correct.

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