When we pass carbon dioxide gas through a green coloured solution of potassium manganate, the colour of solution changes to purple and a brown coloured solid gets precipitated. The green colour of potassium manganate solution also becomes purple when it is subjected to electrolysis using iron electrodes.
In following reaction
` 3 K_2 underset("(green)")(MnO_4 + 2H_2 O + 4CO_2 to underset("(purple)")(2KmnO_4 )+MnO_2 + 4KHCO_3 ` the function of ` CO_2 ` is

Options

A. to make solution acidic
B. to make solution basic
C. to act only as a medium of reaction
D. none of the above

Answer

A

Explanation

Its function is to make solution acidic.