Question

Potassium dichromate can be prepared by:

• A. heating $N{a}_{2}Cr{O}_4$ solution with $KCl$ solution and then cooling
• B. heating powdered chromite ore with quicklime in the presence of air
• C. heating $K_{2}Cr{O}_4$ with sulphuric acid
• D. both $A$ and $C$

Answer 1

The correct option is D both $A$ and $C$

Potassium dichromate is usually prepared by the reaction of potassium chloride on sodium dichromate.

$N{a}_{2}C{r}_2{O}_7+2KCl\to K_{2}C{r}_2{O}_7+2NaCl$

It can also be prepared by heating $K_{2}Cr{O}_4$ with $H_{2}S{O}_4$.

$2K_{2}Cr{O}_4+2H^{+}\to K_{2}C{r}_2{O}_7+2K^{+}+H_{2}O$

Hence, option D is correct.