Which is not correct in case of Mohr's salt? (A) It decolourises \( \mathrm{KMnO}_{4} \) (B) It ...

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Which is not correct in case of Mohr's salt?
(A) It decolourises \( \mathrm{KMnO}_{4} \)
(B) It is primary standard
(C) It is a double salt
(D) Oxidation state of \( \mathrm{Fe} \) is \( +3 \) in the salt
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