Q. Which one of the following reactions involves disproportionation?
A) $2H_{2}{SO}_{4} + Cu\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {CuSO}_{4} + 2H_{2}O + {SO}_{2}$
B) ${As}_{2}O_{3} + 3H_{2}S\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {As}_{2}S_{3} + 3H_{2}O$
C) $2KOH + {Cl}_{2}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ KCl + KOCl + H_{2}O$
D) ${Ca}_{3}P_{2} + 6H_{2}O\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 3Ca(OH)_{2} + 2{PH}_{3}$
Explanation
(c)
The reactions, in which the same element is oxidised as well as reduced, are called disproportionation reactions.
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In this reaction, the same element,$ie.,{Cl}_{2}$ is oxidised as well as reduced, so it is an example of disproportionation reaction.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.