Which one of the following compounds on reaction with \( \mathrm{Na...

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Which one of the following compounds on reaction with \( \mathrm{Na}_{2} \mathrm{O}_{2} \) in alkaline medium gives yellow colour solution?
P
(a) \( \mathrm{Cr}(\mathrm{OH})_{3} \)
(b) \( \mathrm{Zn}(\mathrm{OH})_{2} \)
W
(c) \( \mathrm{Al}(\mathrm{OH})_{3} \)
(d) None of these.
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