(A) $\mathrm{ICl}_4^{-}:$Steric Number $=\frac{1}{8}(7+(4 \times 7)+1)=\frac{36}{8}$ $=4+4$; b.p. $=4$, e.p. $=\frac{4}{2}=2$
$\therefore \quad \mathrm{ICl}_4^{-} \rightarrow \mathrm{sp}^3 \mathrm{~d}^2$ hybridization
(B)
$$
\begin{aligned}
& \mathrm{NO}_3^{-}: \frac{1}{8}(5+(3 \times 6)+1) \\
& =\frac{1}{8} \times 24=3 \text { b.p., } \mathrm{sp}^2 \text { hybridization }
\end{aligned}
$$
(C)
$$
\begin{aligned}
& \mathrm{PCl}_4^{+}: \frac{1}{8}(5+(4 \times 7)-1) \\
& =\frac{1}{8} \times 32=4 \text { b.p., } \mathrm{sp}^3 \text { hybridization }
\end{aligned}
$$
(D)
$$
\begin{aligned}
& \mathrm{SiF}_6^{2-}: \frac{1}{8}(4+(6 \times 7)+2) \\
& =\frac{1}{8} \times 48=6 \text { b.p., } \mathrm{sp}^3 \mathrm{~d}^2 \text { hybridization }
\end{aligned}
$$