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\[
\begin{array}{l}
\mathrm{Cl}_{2}(g)+\mathrm{Ba}(\mathrm{OH})_{2} \longrightarrow X(a q .)+\mathrm{BaCl}_{2}+\mathrm{H}_{2} \mathrm{O} \\
X+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow Y+\mathrm{BaSO}_{4} \\
Y \underset{\Delta365 \mathrm{~K}}{\stackrel{\Delta}{\longrightarrow}} Z+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \\
\end{array}
\]
\( \mathrm{P} \)
W
\( Y \) and \( Z \) are respectively :
(a) \( \mathrm{HClO}_{4}, \mathrm{ClO}_{2} \)
(b) \( \mathrm{HClO}_{3}, \mathrm{ClO}_{2} \)
(c) \( \mathrm{HClO}_{3}, \mathrm{ClO}_{6} \)
(d) \( \mathrm{HClO}_{4}, \mathrm{Cl}_{2} \mathrm{O}_{7} \)
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