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Which of the following statement (s) is/are correct?
(A) \( \mathrm{S}_{2} \mathrm{O}_{8}{ }^{2-} \) oxidise \( \mathrm{Ag}^{-} \)in presence of pyridine and give
\( \mathrm{P} \) red colour compound.
(B) \( \mathrm{MnO}_{4}^{2} \) disproportionates to yield \( \mathrm{MnO}_{4}^{-} \)and \( \mathrm{MnO}_{2} \)
W in presence of \( \mathrm{H}^{+} \)ions.
(C) \( \mathrm{In} \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) each \( \mathrm{Cr} \) is linked to four oxygen atoms.
(D) \( \mathrm{Ti}^{2+} \) is purple while \( \mathrm{Ti}^{4+} \) is colourless.
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