Pick out the incorrect statement: (a) \( \mathrm{MnO}_{2} \) dissolves in conc. \( \mathrm{HCl} ...

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Pick out the incorrect statement:
(a) \( \mathrm{MnO}_{2} \) dissolves in conc. \( \mathrm{HCl} \), but does not form \( \mathrm{Mn}^{4+} \) ions.
(b) \( \mathrm{MnO}_{2} \) oxidizes hot concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \) liberating oxygen.
(c) \( \mathrm{K}_{2} \mathrm{MnO}_{4} \) is formed when \( \mathrm{MnO}_{2} \) in fused \( \mathrm{KOH} \) is oxidised by air, \( \mathrm{KNO}_{3}, \mathrm{PbO}_{2} \) or \( \mathrm{NaBiO}_{3} \).
(d) Decomposition of acidic \( \mathrm{KMnO}_{4} \) is not catalysed by sunlight.
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