\[ \begin{array}{l} \mathrm{ZnS}+2 \mathrm{HCl} \rightarrow \mathrm...
0\[
\begin{array}{l}
\mathrm{ZnS}+2 \mathrm{HCl} \rightarrow \mathrm{A}_{\longrightarrow}+\mathrm{H}_{2} \mathrm{~S} \\
\text { A }+2 \mathrm{NaOH} \rightarrow \underset{\text { B }}{[}+2 \mathrm{NaCl} \\
\text { B }+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_{2} \mathrm{ZnO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \\
\end{array}
\]
\( \mathrm{P} \)
Sodium zincate
\( \mathrm{A}, \mathrm{B} \) in the above reaction is-
(1) \( \mathrm{A}=\mathrm{ZnCl}_{2}, \mathrm{~B}=\mathrm{Zn}(\mathrm{OH})_{2} \)
(2) \( \mathrm{A}=\mathrm{ZnCl}_{2}, \mathrm{~B}=\mathrm{ZnO} \)
(3) \( \mathrm{A}=\mathrm{Zn}(\mathrm{OH})_{2}, \mathrm{~B}=\mathrm{ZnCl}_{2} \)
(4) \( \mathrm{A}=\mathrm{B}=\mathrm{ZnCl}_{2} \)
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