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Find the gases for which the following s...

Find the gases for which the following statements are related:
a) Burns explosively in air.
b) Gas used for the purification of water.
c) Gas interacting with the rhizobium bacteria in the soil.
d) Gas formed by the thermal decomposition of `KMnO_4`

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a) Hydrogen
b) Chlorine
c) Nitrogen
d) Oxygen
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