Chromate

Chromates and dichromates are salts of chromic acid and dichromic acid, respectively. Chromate salts contain the chromate anion, CrO2−4, and usually have an intense yellow color. Dichromate salts contain the dichromate anion, Cr2O2−7, and usually have an intense orange color. The chromates and dichromates of heavy metals (such as silver and lead) often have a red color.

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