Thermal decomposition of a Mn compound \( (\mathrm{X}) \) at \( 513 \mathrm{~K} \) results in co...

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Thermal decomposition of a Mn compound \( (\mathrm{X}) \) at \( 513 \mathrm{~K} \) results in compound \( \mathrm{Y}, \mathrm{MnO}_{2} \) and a gasesous product. \( \mathrm{MnO}_{2} \) reacts with \( \mathrm{NaCl} \) and concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \) to give a pungent gas \( \mathrm{Z} . \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \), respectively, are:
(a) \( \mathrm{KMnO}_{4}, \mathrm{~K}_{2} \mathrm{MnO}_{4} \) and \( \mathrm{Cl}_{2} \)
(b) \( \mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4} \) and \( \mathrm{SO}_{2} \)
(c) \( \mathrm{K}_{3} \mathrm{MnO}_{4}, \mathrm{~K}_{2} \mathrm{MnO}_{4} \) and \( \mathrm{Cl}_{2} \)
(d) \( \mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4} \) and \( \mathrm{Cl}_{2} \)
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