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answer is 4.
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Detailed Solution
1) NaCl+1+K+1NO3→Na+1×NO3+K+1Cl Not a redox reaction 2) CaC2 O4 +2HCl →CaCl2+H2 C2O4 Not a redox reactionNot a redox reaction 4) Zn+2AgCN+1→2Ag0+Zn(CN)2 redox reaction