Which is a redox reaction?
ANaOH + HCl → NaCl + H₂O
BMg + 2HCl → MgCl₂ + H₂CORRECT
CAgNO₃ + NaCl → AgCl + NaNO₃
DCO₂ + H₂O → H₂CO₃
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Why the answer is B, and why the others tempt you.
Mg loses electrons (oxidised); H⁺ gains them (reduced). The others are not redox.
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