When `SO_2` gas is passed through an acidified solution of `K_2 Cr_2 O_7`, the solution turns ___ in colour.

When SO_2 is passed through acidified solution of H_2S

When SO_2 is passed through acidified K_2Cr_2O_7 solution

When SO_2 is passed through the acidic solution of K_2 Cr_2 O_7

H_(2)S gas is passed through an acidic solution of K_(2)Cr_(2)O_(7) .The solution turns milky, why?

When SO_(2) gas is passed through an acidified solution of K_(2)Cr_(2)O_(7) the orange colour of the solution changes to