2MnO^- 4 + bI^- + cH2O → xI2 + yMnO2 + zOH^-

Question

\(2Mn O ^{-} _ 4 + bI^- + cH _2O \rightarrow xI _2 + y Mn O_2 + z OH ^-\)

If the above equation is balanced with integer coefficients, the value of z is _______

Answer 1

Correct answer is : 8

Adding oxidation half and reduction half, net reaction is

\(2Mn O^-_4 +6I^- + 4H _2 O \rightarrow 3 I_2 +2Mn O_2 + 8OH^-\)

⇒ z = 8