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AIEEE 2002
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Which of the following is a redox reaction ?
A
NaCl + KNO3 $$\to$$ NaNO3 + KCl
B
CaC2O4 + 2HCl $$\to$$ CaCl2 + H2C2O4
C
Mg(OH)2 + 2NH4Cl $$\to$$ MgCl2 + 2NH4OH
D
Zn + 2AgCN $$\to$$ 2Ag+ Zn(CN)2
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