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# $Cu+H_2\quad\underrightarrow {heat}\quad Cu+x$,$ZnO+y\quad\underrightarrow{heat} \quad Zn+H_2O$,$2AgCl+H_2\rightarrow z+w$.The $w$ is

$\begin{array}{1 1}(a)\;HCl_2\\(b)\;HCl_3\\(c)\;2HCl\\(d)\;HCl\end{array}$

$2AgCl+H_2\rightarrow 2Ag+2HCl$.
Hence w is $2HCl$
Hence (c) is the correct answer.