Question

Acidified $${K_2}C{r_2}{O_7}$$   solution turns green when $$N{a_2}S{O_3}$$  is added to it. This is due to the formation of

A. $$CrO_4^{2 - }$$
B. $$C{r_2}{\left( {S{O_3}} \right)_3}$$
C. $$CrS{O_4}$$
D. $$C{r_2}{\left( {S{O_4}} \right)_3}$$  
Answer :   $$C{r_2}{\left( {S{O_4}} \right)_3}$$
Solution :
$${K_2}C{r_2}{O_7}\,\,{\text{is oxidising reagent}}{\text{.}}$$
$${K_2}C{r_2}{O_7} + 3N{a_2}S{O_3} + 4{H_2}S{O_4}$$       $$ \to 3N{a_2}S{O_4} + {K_2}S{O_4} + C{r_2}{\left( {S{O_4}} \right)_3}$$       $$ + 4{H_2}O$$

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. $$9:4$$
View Answer
Releted Question 2

Which of the following is the weakest base

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

One of the constituent of German silver is

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

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

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

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D and F Block Elements

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