In the given which one is element ?

  1. A

    CO

  2. B

    Nitrogen

  3. C

    Water

  4. D

    Soil

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    Solution:

    The compound CO is a chemical combination of carbon and oxygen. 

    Composition of water is oxygen and hydrogen. Soil contains different elements like Si, Al and Ca  oxides. But Nଶ molecule contains only one kind of atoms i.e. nitrogen, Hence nitrogen is element.

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