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[tex]H_2 + O_2 = H_2O[/tex]
Here H is balanced but Obis unbalanced
So put 2 to H20 to balance O
[tex]H_2 + O_2 = 2H_2O[/tex]
now H becomes unbalanced
So put 2 before H2
[tex]2H_2 + O_2 = 2H_2O[/tex]
option a is correct
~Tulpe⚘