When a salt is heated with dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and \( \mathrm{KMnO}_{4} \)...

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When a salt is heated with dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) and \( \mathrm{KMnO}_{4} \) solution, the pink colour of \( \mathrm{KMnO}_{4} \) is discharged, the mixture may contain ?
(A) Sulphite
(B) Carbonate
(C) Nitrate
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