A) It decolourises \[KMn{{O}_{4}}\]
B) It is a primary standard
C) It is a double salt
D) Oxidation state of iron is +3 in this salt
Correct Answer: D
Solution :
Oxidation state of iron in mohr?s salt \[FeS{{O}_{4}}{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] is + 2.
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