1.

Co^(2+) + KCN (not in excess) to precipitate. Select the correct statement(s) with respect to the precipitate.

Answer»

It is yellow in colour
It is reddish-brown in colour
It dissolves in excess of the reagent forming a brown solution
It is obtained when brown solution (option C) is acidified with DILUTE `HCL` in the cold.

Solution :`Co^(2+)+2CN^(-)toCo(CN)_(2)darr`(reddish-brown)
`Co(CN)_(2)darr +4CN^(-)("excess")to [Co(CN)_(6)]^(4-)` (brown solution)
`[Co(CN)_(6)]^(4-)+4H^(+)to Co(CN)_(2)darr +4HCN`


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