Multiple choice general knowledge science & technology

The oxidation number of Fe in K 3[Fe(CN) 6] is

  1. +2

  2. -2

  3. +3

  4. -1
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C Correct answer
Explanation

In K3[Fe(CN)6]: K is +1 each (total +3), CN is -1 each (total -6). For neutral compound: +3 + Fe + (-6) = 0, so Fe = +3. This is ferricyanide; the related ferrocyanide K4[Fe(CN)6] has Fe(+2).

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