Question

Which of the following reactions are involved in the process of preparation of potassium dichromate?
$$\eqalign{ & \left( {\text{i}} \right)4FeC{r_2}{O_4} + 8N{a_2}C{O_3} + 7{O_2} \to \cr & \left( {{\text{ii}}} \right)N{a_2}Cr{O_4} + {H_2}S{O_4} \to \cr & \left( {{\text{iii}}} \right)N{a_2}C{r_2}{O_7} + 2KCl \to \cr} $$

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (i), (ii) and (iii)  
Answer :   (i), (ii) and (iii)
Solution :
$$\left( {\text{i}} \right)4FeC{r_2}{O_4} + 8N{a_2}C{O_3} + 7{O_2}$$       $$ \to 8N{a_2}Cr{O_4} + 2F{e_2}{O_3} + 8C{O_2}$$
$$\left( {{\text{ii}}} \right)2N{a_2}Cr{O_4} + {H_2}S{O_4} \to $$      $$N{a_2}C{r_2}{O_7} + N{a_2}S{O_4} + {H_2}O$$
$$\left( {{\text{iii}}} \right)N{a_2}C{r_2}{O_7} + 2KCl \to $$      $${K_2}C{r_2}{O_7} + 2NaCl$$

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. $$9:4$$
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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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