Q. Of the following reactions, only one is a redox reaction. Identify this reaction.
A) $Ca(OH)_{2} + 2HCl \longrightarrow {CaCl}_{2} + 2H_{2}O$
B) $2S_{2}O_{7}^{2 -} + 2H_{2}O \longrightarrow {2SO}_{4}^{2 -} + 4H^{+}$
C) ${BaCl}_{2} + {MgSO}_{4} \longrightarrow {BaSO}_{4} + {MgCl}_{2}$
D) ${Cu}_{2}S + 2FeO \longrightarrow 2Cu + 2Fe + {SO}_{2}$
Explanation
(d)
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In this reaction Cu and Fe undergo reduction while sulphur undergoes oxidation. Hence, this is a redox reaction.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.