The colour of K2Cr2O7 changes from red orange to lemon yellow on treatment with aqueous KOH because of

Question

The colour of K2Cr2O7 changes from red orange to lemon yellow on treatment with aqueous KOH because of (A) reduction of Cr(VI) to Cr(III) (B) formation of chromium ion and chromate ion (C) conversion of dichromate ion to chromate ion (D) oxidation of potassium hydroxide to potassium peroxide

Tardigrade Admin · Accepted Answer

In basic medium, dichromate ion changes to chromate ion K2Cr2O7+2KOH leftharpoons 2K2CrO4+H2O

Q. The colour of $K_{2} C r_{2} O_{7}$ changes from red orange to lemon yellow on treatment with aqueous $K O H$ because of

reduction of Cr(VI) to Cr(III)

formation of chromium ion and chromate ion

conversion of dichromate ion to chromate ion

oxidation of potassium hydroxide to potassium peroxide

In basic medium, dichromate ion changes to chromate ion
$K_{2} C r_{2} O_{7} + 2 K O H ⇌ 2 K_{2} C r O_{4} + H_{2} O$

Q. The colour of K2​Cr2​O7​ changes from red orange to lemon yellow on treatment with aqueous KOH because of