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

ಕೆಳಗಿನವುಗಳಲ್ಲಿ ಯಾವುದು ಸಮತೋಲಿತ ರಾಸಾಯನಿಕ ಸಮೀಕರಣವಾಗಿದೆ?

1
Na + H 2 O → NaOH + H 2
2
H 2 + O 2 → H 2 O
3
Mg + O 2 → MgO
4
2Mg + O 2 → 2MgO
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