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 Form 1 Chemistry Sample Exam Revision Questions With Answers

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

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