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A = CrO2Cl2B = Na2CrO4C = PbCrO4X = NH4ClD = Millon's base of Iodide = HgO·Hg(NH2)I
The Reactions would be:For chromyl chloride,4NH4Cl + K2Cr2O7 + 3H2SO4 → 2(NH4)2SO4 + K2SO4 + 2CrO2Cl2For Sodium ChromateCrO2Cl2 +NaOH → Na2CrO4 + 2H2O +2NaClFor lead ChromateNa2CrO4 + (CH3COO)2Pb →PbCrO4 + 2CH3COONaFor Millions base of Iodide3NaOH + NH4Cl + 2K2HgI4 → HgO.Hg(NH2)I + 4KI + 3NaI + HCl
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