railway DFCCIL MTS 2025 Mock Test Series General Science

பின்வரும் இரசாயன எதிர்வினைகளில் எது சமநிலையானது?

1
Fe + 4H 2 O → Fe 3 O 4 + 4H 2
2
Fe + H 2 O → Fe 3 O 4 + H 2
3
Zn + H 2 SO 4 → ZnSO 4 + H 2
4
Mg + O 2 → MgO
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