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Which reaction is NOT a redox reaction? [NEET 2024]

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Which reaction is NOT a redox reaction?

[NEET 2024]

a

\(BaC{l}_{2}+N{a}_{2}S{O}_{4}\to BaS{O}_{4}+2NaCl\)

b

\(Zn+CuS{O}_{4}\to ZnS{O}_{4}+Cu\)

c

\(2KCl{O}_{3}+{I}_{2}\to 2KI{O}_{3}+C{l}_{2}\)

d

\({H}_{2}+C{l}_{2}\to 2HCl\)

✓ Correct answer: a)

\(BaC{l}_{2}+N{a}_{2}S{O}_{4}\to BaS{O}_{4}+2NaCl\)

Explanation

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl is a double displacement reaction with no change in oxidation states, so it is not a redox reaction. In the other options, there is a clear change in oxidation numbers indicating redox processes.

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