engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) General Science Chemistry

নীচের কোন রাসায়নিক সমীকরণটি সাম্যাবস্থায় রয়েছে ?

1
Na + H2O → NaOH + H2
2
H2 + O2 → H2 O
3
Mg + O2 → MgO
4
2Mg + O2 → 2MgO
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