When aqueous sodium hydroxide is added to an aqueous solution of chromium(III) ions

CHEMISTRY · Single correct · CBSE · Chemistry · Coordination Compounds · Coordination Compounds

Problem

When aqueous sodium hydroxide is added to an aqueous solution of chromium(III) ions, a green-blue precipitate is first formed, which re-dissolves to give a green solution. This green colour is due to: (1) [Cr(H2O)6]3+[\text{Cr}(\text{H}_2\text{O})_6]^{3+} (2) CrO42−\text{CrO}_4^{2-} (3) [Cr(OH)4]−[\text{Cr}(\text{OH})_4]^- (4) [Cr(OH)3(H2O)3][\text{Cr}(\text{OH})_3(\text{H}_2\text{O})_3]

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