Nitrogen can be obtained from air by removing

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(D) Air is a mixture of gases,primarily $N_2$ $(78\%)$ and $O_2$ $(21\%)$,with small amounts of $CO_2$,water vapor,and noble gases.To obtain pure nitr

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Both $(a)$ and $(c)$

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(D) Air is a mixture of gases,primarily $N_2$ $(78\%)$ and $O_2$ $(21\%)$,with small amounts of $CO_2$,water vapor,and noble gases.To obtain pure nitrogen from air,oxygen is removed by passing air over heated copper or by other chemical methods,and carbon dioxide is removed by passing air through a potassium hydroxide $(KOH)$ solution.Therefore,nitrogen is obtained by removing both oxygen and carbon dioxide.

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