Q. When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of
A) $CrO_{3}$
B) $Cr_{2}O_{3}$
C) $CrO_{5}$
D) $CrO_{4}^{2 -}$
Explanation
(c)
$H_{2}O_{2}$ oxidises the acidified potassium dichromate solution into blue peroxide of chromium, $CrO_{5}.$
$Cr_{2}O_{7}^{2 -} + 2H^{+} + 4H_{2}O_{2}\ \rightarrow 2CrO_{5} + 5H_{2}O$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.