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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.
3820211514.png
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-Argon
b).i).Passing through concentrated NaOH or KOH to remove #CO_2#
ii).Cooling it to #-25^oC# to remove water vapor.


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