1.

The colour of CuCr_(2)O_(7) solutioin is water is green because

Answer»

`Cr_(2)O_(7)^(2-)` IONS are GREEN
`Cu^(++)` ions are green
Both ions are green
`Cu^(++)` ions are blue and `Cr_(2)O_(7)^(2-)` ions are yellow

Solution :`Cu^(++)` ions are blue and `Cr_(2)O_(7)^(-)` ions are yellow, yellow and blue COMBINATION gives-green colour.


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