Redox and Equivalent ConceptMedium
Question
Which reaction is NOT a redox reaction?
Options
A.$H_{2} + {Cl}_{2} \rightarrow 2HCl$
B.${BaCl}_{2} + {Na}_{2}{SO}_{4} \rightarrow {BaSO}_{4} + 2NaCl$
C.$Zn + {CuSO}_{4} \rightarrow {ZnSO}_{4} + Cu$
D.$2{KClO}_{3} + I_{2} \rightarrow 2{KIO}_{3} + {Cl}_{2}$
Solution
Sol. [Key Concept: Oxidation state test for redox reactions]
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl is a precipitation or double displacement reaction. Ba remains +2, Na +1, Cl −1, S +6 and O −2; therefore no oxidation number changes. This is option (2). In the other choices H/Cl, Zn/Cu, or I/Cl undergo changes in oxidation state.
(1)
(2) $\ \overset{+ 2}{BaCl}\ _{2}^{- 1} + \overset{+ 1}{{Na}_{2}}{SO}_{4}^{- 2} \longrightarrow {BaSO}_{4} + 2{NaCl}^{+ 1}$
This is not a redox reaction as there is no change in oxidation state.
(3) 
(4) 2 KClO₃ + I₂ → 2 KIO₃ + Cl₂.
Chlorine: +5 to 0, reduction. Iodine: 0 to +5, oxidation.
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