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

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Q. The colour of $K_{2}Cr_{2}O_{7}$ changes from red orange to lemon yellow on treatment with aqueous $KOH$ because of

Redox Reactions

Solution:

In basic medium, dichromate ion changes to chromate ion
$K_{2}Cr_{2}O_{7}+2KOH \rightleftharpoons 2K_{2}CrO_{4}+H_{2}O$