Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Science Chemistry Chemical Reaction

Which of the following reactions is an example of auto-reduction?

1
Fe3O4 + 4CO → 3Fe + 4CO2
2
Cu2O + C → 2Cu + CO
3
Cu2+(aq) + Fe(s) → Cu(s) + Fe2+(aq)
4
Cu2O + ½ Cu2S → 3Cu + ½ SO2
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