Which of the following is a redox reaction?

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NaCl+KNO3⟶NaNO3+KCl

CaC2O4+2HCl⟶CaCl2+H2C2O4

Mg(OH)2+2NH4Cl⟶MgCl2+2NH4OH

Zn+2AgCN⟶2Ag+Zn(CN)2

answer is D.

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Detailed Solution

Zn⟶Zn2++2e−Ag⊕+e−⟶AgIn (1), (2), and (3), oxidation number does not change.

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