Teaching UP TGT Mock Test Series 2025 General Science Chemistry Chemical Reaction

নীচের কোনটি সংযোজন বিক্রিয়ার উদাহরণ?

1
2Mg (s) + O2 (g) → 2MgO (s)
2
Fe2O3 (s) + 2Al (s) → Al2O3 (s) + 2F3 (s)
3
CaCO3 (s) → CaO (s) + CO2 (g)
4
Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)
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