You have two solutions of chromium ions.Your lab partner has added potassium thiocyanate to one and potassium cyanide to the other, but does NOT remember which one contains which anion.Just by appearance, how can you tell them apart?

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You have two solutions of chromium ions.Your lab partner has added potassium thiocyanate to one and potassium cyanide to the other, but does NOT remember which one contains which anion.Just by appearance, how can you tell them apart?