(C) Potassium dichromate $(K_2Cr_2O_7)$ is a strong oxidizing agent. In an aqueous solution,the dichromate ion $(Cr_2O_7^{2-})$ exists in equilibrium

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(C) Potassium dichromate $(K_2Cr_2O_7)$ is a strong oxidizing agent. In an aqueous solution,the dichromate ion $(Cr_2O_7^{2-})$ exists in equilibrium with the chromate ion $(CrO_4^{2-})$. The potassium dichromate solution is characteristically orange in color due to the presence of the dichromate ion.