what chemical reaction occurs when oxygen gas is combined with hydrogen gas

Question

owlfred · Answer

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anonymous · Answer

combination reaction occurs, Actually it is an electrolysis method of preparing water

anonymous · Answer

2H2  +   O2  -->   2H2O

anonymous · Answer

At normal conditions no reaction occurs but on an electric spark combination reaction occurs to give H2O 
H2 + O2 = H2O

anonymous · Answer

When 2 hydrogen bonds with 1 oxygen molecule they form H2O or water by means of covalent bonding.