Which one of these reactions is a redox reaction
NaCl + KNO3 --------------->NaNO3 + KCl
CaC3O4 + 2HCl--------------->CaCl2 + H2C2O4
Mg(OH)2 + 2NH4Cl-------------------->MgCl2 + 2NH4OH
Zn + 2AgCN---------------------------->2Ag + Zn(CN)2
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Answer:
option 4 ,Zn +2AgCN ---> 2Ag +Zn(CN)2
Explanation:
oxidatoin state of zinc changes zero to +2
oxidation state of Ag changes 2 to zero
hence due to change in oxidation state it is redox reaction
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