The colour of $\mathrm{CuCr}_{2} \mathrm{O}_{7}$ solution in water is green because

The colour of $\mathrm{CuCr}_{2} \mathrm{O}_{7}$ solution in water is green because
  1. $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ ions are green.
  2. $\mathrm{Cu}^{2+}$ ions are green.
  3. Both $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ and $\mathrm{Cu}^{2+}$ ions are green.
  4. $\mathrm{Cu}^{2+}$ ions are blue and $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ ions are yellow.

Solution

Green colour of $\mathrm{CuCr}_{2} \mathrm{O}_{7}$ is due to blue colour of $\mathrm{Cu}^{2+}$ ions and yellow colour of $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ ions .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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