Q. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
A) +3
B) +2
C) +6
D) +4
Explanation
(a)
${{Cr}_{2}O}_{7}^{2 -} + 14H^{+} + 6I^{-} \longrightarrow 2{Cr}^{3 +} + 7H_{2}O + 3I_{2}$
${Cr}_{2}O_{7}^{2 -}$is reduced to${Cr}^{3 +}.$
Thus, final state of Cr is +3. Hence, (a)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.