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

Which of the following equation is not the balanced chemical reaction?
Chemical Reaction
1. CH4 + 2O2 → CO2 + 2H2O
2. 2Fe2O3 + C → 4Fe + 3CO2
3. 2Mg + O2 → 2MgO

1
1
2
2
3
3
4
None
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