Question

Q.1.C. Find odd man out:
1. KMnO4 H2SO4, HCI, H2
2. 2Mg + 02 - Mg0.
2Cu+O, +2Cuo
2Cu+O, —>2Cuo
CaCOẠCaO+CO,
3. CuSO, +FeFeSO, + Cu
2KCIO, —>2KCI +30,
2AgC12Ag+Cl,
CaCOẠCaO+CO,
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Answer 1

Answer:

how we can find it out ???? can anyone explain tht???