Question

In acidic medium, hydrogen peroxide changes potassium dichromate to a deep blue compound having two peroxy linkage. choose the correct formula of the compound.

• A. $Cr{O}_5$
• B. $K_{2}Cr{O}_4$
• C. $C{r}_2{O}_3$
• D. $CrO$

Answer 1

The correct option is A $Cr{O}_5$

Chromium(VI) oxide peroxide, also known as chromium(VI) peroxide or chromium pentoxide $\left(Cr{O}_5\right)$ is an unstable compound formed by the addition of an acidified hydrogen peroxide solution to solutions of metal chromates, such as sodium or potassium chromate, and followed by extraction from aqueous solution with an organic solvent, such as diethyl ether.
$C{r}_2{O}_7^{2-}+2H^{+}+4H_2{O}_2\to 2Cr{O}_5+5H_{2}O$