1.

An aqueous solution of a metal sulphide is blue colured and on treatment with aqueous NaOH solution forms a blue precipitate (X). The precipitate 'X' is insoluble inexcess of NaOH and on heating it converts intoa black solid (Y). The X and Y respectively are most likely to be

Answer»

`CuSO_(4)` and `Cu_(2)O`
`CO` and `Cu_(2)O`
`Cu(OH)_(2)` and `CuO`
`CuOH` and `CuO`

ANSWER :C


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