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Which of the following is a redox reaction? (a) NaCl + KNO3 → NaNO3 + KCI

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Which of the following is a redox reaction?

(a) NaCl + KNO3 → NaNO3 + KCI

(b) CaC2O4 + 2HCl → CaCl2 + H2C2O4

(c) Mg(OH)2 + 2NH4Cl → MgCl2 + 2NH4OH

(d) Zn + 2AgCN → 2Ag + Zn(CN)2

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Correct option is (d) Zn + 2AgCN → 2Ag + Zn(CN)2

Zn → Zn2+ (oxidation); Ag+ + e- → Ag (reduction)

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