1.

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 greeen solution. This green colour is due to :

Answer»

`[CR(H_(2)O)_(6)]^(3+)`
`CrO_(4)^(2-)`
`[Cr(OH)_(4)]^(-)`
`[Cr(OH)_(3)(H_(2)O)_(3)]`

ANSWER :C


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