Question
The colour of $$CuC{r_2}{O_7}$$ solution in water is green because
A.
$$C{r_2}O_7^{2 - }\,ions$$ are green.
B.
$$C{u^{2 + }}\,ions$$ are green.
C.
Both $$C{r_2}O_7^{2 - }$$ and $$C{u^{2 + }}\,ions$$ are green.
D.
$$C{u^{2 + }}\,ions$$ are blue and $$C{r_2}O_7^{2 - }\,ions$$ are yellow.
Answer :
$$C{u^{2 + }}\,ions$$ are blue and $$C{r_2}O_7^{2 - }\,ions$$ are yellow.
Solution :
Green colour of $$CuC{r_2}{O_7}$$ is due to blue colour of $$C{u^{2 + }}\,ions$$ and yellow colour of $$C{r_2}O_7^{2 - }\,ions.$$