This is a past paper MCQ of O Level Chemistry (5070). I want to understand that why is the answer D? Why not B? I know that D is correct but why is B wrong? Please help me. Thank You.
Which ionic equation describes a redox reaction?
A. Ag+ + Cl- --> AgCl
B. 2H+ + CO3(2-) --> CO2 + H2O
C. H+ + OH- --> H2O
D. Zn + Cu2+ --> Zn2+ + Cu
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