Teaching Bihar B.Ed CET Mock Test Series 2025 General Science Chemistry Chemical Reaction

Which of the following is NOT a redox reaction?

1
3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)
2
MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g)
3
CuO(s) + H2(g) → Cu(s) + H2O(l)
4
CaO(s) + H2O(l) → Ca(OH)2(aq)
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