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  4. The colour of CuCr2O7 solution in water is green because ?

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Q. The colour of $CuCr_2O_7$ solution in water is green because ?

The d-and f-Block Elements

Solution:

The colour of $CuCr_2O_7$ solution in water is green because $Cu^{2+}$ ions are blue and $CuCr_2O_7$ ions are yellow. A mixture of blue and yellow colours appears green