Q

Which of the following reactions is not an example of redox reaction? (i) ZnO + C → Zn + CO (ii) MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 (iii) 4Na + O2 → 2Na2O (iv) AgNO3 + NaCl → AgCl + NaNO3

RRB Group D, 17-Aug-22 S-2 2022
✓ Answer: A (iv)
The reaction AgNO3 + NaCl → AgCl + NaNO3 is not a redox reaction. It is a double displacement (metathesis) reaction, where ions are exchanged between two compounds without any change in oxidation states. In contrast, the other reactions involve changes in oxidation states, making them redox reactions.
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