What is the oxidation number of Mn in KMnO4,K2MnO4,MnSO4,MnO2 and Mn3O4 respectively?
+4,+6,+2,+4,+83
+7,+6,+2,+4,+83
+7,+6,+2,+3,+83
None of these
A
+4,+6,+2,+4,+83
B
+7,+6,+2,+3,+83
C
+7,+6,+2,+4,+83
D
None of these
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Solution
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The correct option is A+7,+6,+2,+4,+83 Let x be the oxidation number of Mn. Since, the overall charge on the complex is 0, the sum of oxidation states of all elements in it should be equal to 0. K2MnO4; 2+x+4(−2)=0;x=+6
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