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 $$C{r_2}O_7^{2 - }\,ions.$$

Releted MCQ Question on
Inorganic Chemistry >> D and F Block Elements

Releted Question 1

When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved is

A. $$1:1$$
B. $$1:2$$
C. $$2:1$$
D. $$9:4$$
Releted Question 2

Which of the following is the weakest base

A. $$NaOH$$
B. $$Ca{\left( {OH} \right)_2}$$
C. $$KOH$$
D. $$Zn{\left( {OH} \right)_2}$$
Releted Question 3

One of the constituent of German silver is

A. $$Ag$$
B. $$Cu$$
C. $$Mg$$
D. $$Al$$
Releted Question 4

Which of the following dissolve in hot conc.$$NaOH$$  solution

A. $$Fe$$
B. $$Zn$$
C. $$Cu$$
D. $$Ag$$

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D and F Block Elements


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