\[
\begin{array}{l}
(X)+\mathrm{K}_{2} \mathrm{CO}_{3}+\text { Air } \stackrel{\text { heat }}{\...
\[
\begin{array}{l}
(X)+\mathrm{K}_{2} \mathrm{CO}_{3}+\text { Air } \stackrel{\text { heat }}{\longrightarrow}(Y) \\
(Y)+\mathrm{Cl}_{2} \longrightarrow(Z) \text { Pink }
\end{array}
\]
P
Which of the following is correct ?
W
(a) \( X= \) black, \( \mathrm{MnO}_{2}, Y= \) Blue, \( \mathrm{K}_{2} \mathrm{CrO}_{4}, Z=\mathrm{KMnO}_{4} \)
(b) \( X= \) green, \( \mathrm{Cr}_{2} \mathrm{O}_{3}, Y= \) Yellow, \( \mathrm{K}_{2} \mathrm{CrO}_{4}, Z=\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \)
(c) \( X= \) black, \( \mathrm{MnO}_{2}, Y= \) green, \( \mathrm{K}_{2} \mathrm{MnO}_{4}, Z=\mathrm{KMnO}_{4} \)
(d) \( X= \) black; \( \mathrm{Bi}_{2} \mathrm{O}_{3}, Y= \) colourless, \( \mathrm{KBiO}_{2}, Z=\mathrm{KBiO}_{3} \)
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