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Question
Which of the following is a redox reaction ?
NaCl + KNO3 $\to$ NaNO3 + KCl
CaC2O4 + 2HCl $\to$ CaCl2 + H2C2O4
Mg(OH)2 + 2NH4Cl $\to$ MgCl2 + 2NH4OH
Zn + 2AgCN $\to$ 2Ag+ Zn(CN)2

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