1.

In blue solution of copper sulphate excess of KCNis added then solution becomes colourless due to the formation of :

Answer»

`[Cu(CN)_(4)]^(2-)`
`Cu^(2+)` get reduced to FORM `[Cu(CN)_(4)]^(3-)`
`Cu(CN)_(2)`
`CuCN`

Solution :`Cu^(2+)+6CN^(-) to [Cu^(+)(CN)_(4)]^(3-)+(CN)_(2)`
`Cu^(2+)+2CN^(-) to Cu(CN)_(2)darr("yellow"), 2Cu(CN)_(2)darr ("white")+(CN)_(2) darr`
`CuCN darr +CN^(-) to [Cu^(I)(CN)_(4)]^(3-)` (COLOURLESS SOLUBLE complex)


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