Which of the following statements is wrong?

Options

A. Acidified `KMnO_4` solution decolourises on the addition of sodium oxalate
B. In the reaction between `Br_2` and `Csl, Br_2` is an oxidising agent and CSI is a reducing agent
C. In the reaction `2K_2 S_2 O_3 I_2 to 2KI+K_2 S_4 O_6`, the change in the oxidation number of S is 0.5.
D. C has the same oxidation number in both `CH_4` and `CO_2`.

Answer

D

Explanation

The purple colour of `KMnO_4` is decolourised due to the reduction of `MnO_(4)^(Ө)` to `Mn^(2+) and C_2 O_(4)^(2-)` is oxidised to `CO_2` in acidic medium.