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Nitrogen is obtained on large scale by the fractional distillation of air as shown on the flow chart below.

a)Name the substances marked A and B
b)Explain how the following substances are removed during the above process.
i) Carbon(IV) oxide
ii) Water

Answer Text:
a).A- Nitrogen
B-Argon
b).i).Passing through concentrated NaOH or KOH to remove #CO_2#
ii).Cooling it to #-25^oC# to remove water vapor.