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Consider the following reactions :
\[
\begin{array}{c}
2 \mathrm{XS}+3 \mathrm{O}_{2} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{XO}+2 \mathrm{SO}_{2} \\
2 \mathrm{XO}+\mathrm{XS} \stackrel{\Delta}{\longrightarrow} 3 X+\mathrm{SO}_{2}
\end{array}
\]
\( \mathrm{P} \)
Then ' \( X \) ' can not be :
(a) \( \mathrm{Zn} \)
(b) \( \mathrm{Hg} \)
(c) \( \mathrm{Pb} \)
(d) None of these
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