During estimation of oxalic acid \( V s \mathrm{KMnO}_{4} \), self indicator is : (a) \( \mathrm...

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During estimation of oxalic acid \( V s \mathrm{KMnO}_{4} \), self indicator is :
(a) \( \mathrm{KMnO}_{4} \)
(b) oxalic acid
(c) \( \mathrm{K}_{2} \mathrm{SO}_{4} \)
(d) \( \mathrm{MnSO}_{4} \)
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