Which is used to remove \( \mathrm{N}_{2} \) from air? (A) \( \mathrm{Mg} \) (B) \( P \) (C) \( ...

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Which is used to remove \( \mathrm{N}_{2} \) from air?
(A) \( \mathrm{Mg} \)
(B) \( P \)
(C) \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(D) \( \mathrm{CaCl}_{2} \)
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