Question

when our atmosphere in present H2 and O2 but why they are not reacted and make H2O​

Answer 1

Answer:

because for reacting hydrogen and oxygen together certain conditions are required for it which are not accomplished by the substances in the atmosphere

Explanation:

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Answer 2

This is because the speed of the molecules does not provide enough kinetic energy to activate the reaction during collisions between the reactants. We need to provide certain energy to push the mixture over activation energy, which is generally not available in open atmosphere.