Is hydrogen flammable or not? If yes why is it so and if no why no??

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Solution

Hydrogen possesses the NFPA 704's highest rating of 4 on the flammabilityscale because it is flammable when mixed even in small amounts with ordinary air;hydrogen gas and normal air can ignite at as low as 4% air due to the oxygen in the air and the simplicity and chemical properties of the reaction.

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