1.

Deep blue CuSO_(4).5H_(2)O is converted to a bluish white salt at 100^(@)C. At 250^(@)Cand 750^(@)C it is then transformed to a white powder (X) and black material (Y) respectively. Identify the salts.

Answer»

`X =Cu, Y = CuSO_(4)`
`X=Cu_(2)S, Y=CuO`
`X=CuSO_(4).H_(2)O, Y=CuO_(2)`
`X=CuSO_(4).Y=CuO`

Solution :`CuSO_(4).5H_(2)O` crystals effloresce on exposure and converted into a pale blue POWER, `CuSO_(4).3H_(2)O`. When heated to `100^(@)C`, bluish white MONOHYDRATE `CuSO_(4), H_(2)O` is formed. The monohydrate loses molecules of water at `250^(@)C` giving the anhydrous salt, `CuSO_(4)`. which is white. It is heated with `750^(@)C` to FORM cupric oxide and sulphur trioxide.


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