Teaching DSSSB TGT Mock Test 2025 Chemistry

Which one of the following reactions is a redox reaction? 

1
Pb2+(aq) + 2Cl-(aq) → PbCl2(s)
2
AgNO3(aq) + HCl(aq) → AgCl(s) + HNO3(aq)
3
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
4
2Al(s) + 3Cl2(g) → 2AICI3(s).
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