1.

Give the structures of chromate and dichromate ions. How chromates and dichromates can be inter converted?

Answer»

Solution :`CrO_(4)^(2-)` (chromate ion) is tetrahedral where `Cr_(2)O_(7)^(2-)` (dichromate ion) consists of TWO TETRAHEDRA sharing one corner with Cr-O-Cr bond angle `126^(@)`

Depending upon the pH of a solution the chromate ion and dichromate ion inter covertible as
`UNDERSET(("Orange"))(2CrO_(4)^(2-))+ 2H^(+) rarr underset(("YELLOW"))(Cr_(2)O_(7)^(2-)) + H_(2)O`
`underset(("Yellow"))(Cr_(2)O_(7)^(2-)) + 2OH^(-) rarr underset(("Orange"))(2CrO_(4)^(2-)) + H_(2)O`


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