In basic medium the reaction MnO4^- + I^- -> MnO2 + I2 is balanced with H2O and OH^-. In the balanced equation (smallest whole numbers) the coefficient of OH^- is

NEET levelSingle correct optionDifficulty 1 of 3rx096

In basic medium the reaction $MnO X_{4} X^{-} + I X^{-} MnO X_{2} + I X_{2}$ is balanced with $H X_{2} O$ and $OH X^{-}$ . In the balanced equation (smallest whole numbers) the coefficient of $OH X^{-}$ is

Mn gains 3 electrons and each I loses 1, so 2

MnO X_{4} X^{-}

react with 6

I X^{-}

. Balancing charge with

OH X^{-}

and then O and H with

H X_{2} O

gives

2 MnO X_{4} X^{-} + 6 I X^{-} + 4 H X_{2} O 2 MnO X_{2} + 3 I X_{2} + 8 OH X^{-}

. The coefficient of

OH X^{-}

is 8.