(C) $pH$ of $12$ indicates a basic medium.In an alkaline (basic) solution,the dichromate ion $(Cr_2O_7^{2-})$ is converted into the chromate ion $(CrO

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(C) $pH$ of $12$ indicates a basic medium.In an alkaline (basic) solution,the dichromate ion $(Cr_2O_7^{2-})$ is converted into the chromate ion $(CrO_4^{2-})$.The reaction is: $Cr_2O_7^{2-} + 2OH^- \to 2CrO_4^{2-} + H_2O$.The color changes from orange to yellow.