1.

Which of the following compounds, on reaction with NaOH and Na_(2)O_(2), gives yellow colour

Answer»

`Zn(OH)_(2)`
`Al(OH)_(3)`
`CR(OH)_(3)`
`CaCO_(3)`

SOLUTION :Yellow colour is DUE to the formation of `CrO_(4)^(2-)` ion.
`Cr(OH)_(3)+NaOH+Na_(2)O_(2) to Na_(2)CrO_(4)+2H_(2)O`


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