Question

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

• A. $Cr_2O^{2-}_7$ ions are green
• B. $Cu^{2+}$ ions are green
• C. Both ions are green
• D. $Cu^{2+}$ ions are blue and $CuCr_2O_7$ ions are yellow

Answer 1

Answer: (D)

$Cu^{2+}$ ions are blue and $CuCr_2O_7$ ions are yellow

Answer 2

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