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Consider the following sequence of reactions.
The change from \( B \) to \( C \) involves the reaction:
(a) \( \left[\mathrm{Hg}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+2 \mathrm{H}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{Hg}\left(\mathrm{NH}_{2}\right) \mathrm{Cl} \downarrow+3 \mathrm{NH}_{4}^{+} \)
(b) \( \left[\mathrm{Pb}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}^{+}+2 \mathrm{Cl}^{-} \rightarrow \mathrm{PbCl}_{2} \downarrow+4 \mathrm{NH}_{4}^{+} \)
(c) \( \left[\mathrm{Pb}(\mathrm{OH})_{4}\right]^{2-}+4 \mathrm{H}^{+}+2 \mathrm{Cl}^{-} \rightarrow \mathrm{PbCl}_{2} \downarrow+4 \mathrm{H}_{2} \mathrm{O} \)
(d) \( \left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}+2 \mathrm{H}^{+}+\mathrm{Cl}^{-} \rightarrow \mathrm{AgCl} \downarrow+2 \mathrm{NH}_{4}^{+} \)
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