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H2 +o2= Related: Types of Chemical Reaction - Class 7
H2 + O2 will yield H2O but you should balance the formula as there is 2 Oxygen atoms at the left side and only 1 oxygen atom on the right. So:
H2 + 1/2 O2 → H2O
Or
2H2 + O2 → 2H2O
Both are correct, but in highschool chemistry, the second one is more accepted.
This is a concept of combustion. Hydrogen, in both gaseous(natural) and liquid(highly pressurized and supercooled) is highly flammable. And Oxygen is super reactive in the atmosphere.
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H2 +o2= Related: Types of Chemical Reaction - Class 7
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