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WAEC Chemistry questions: Air

16 questions with answers and explanations. Tap an option to check yourself.

AllJAMBWAEC
All topicsAcids, bases and salts · 26Air · 16Atomic structure and bonding · 26Chemical combination · 27Chemical equilibrium · 16Chemistry and industry · 17Electrolysis · 19Energy changes · 16Environmental pollution · 15Kinetic theory of matter and gas laws · 18Metals and their compounds · 23Non-metals and their compounds · 22Organic compounds · 29Oxidation and reduction · 19Rates of chemical reaction · 16Separation of mixtures and purification · 18Solubility · 16Water · 18

  1. Question 1· Air· WAEC

    The components of air can be separated by

    Explanation and discussion

  2. Question 2· Air· WAEC

    Noble gases are used in electric bulbs because they are

    Explanation and discussion

  3. Question 3· Air· WAEC

    The gas in the air used for filling the space above food in packets to keep it fresh is

    Explanation and discussion

  4. Question 4· Air· WAEC

    The gas in the air that causes iron to rust together with water is

    Explanation and discussion

  5. Question 5· Air· WAEC

    Nitrogen is obtained industrially by

    Explanation and discussion

  6. Question 6· Air· WAEC

    The percentage of oxygen in air can be found by passing a measured volume of air over

    Explanation and discussion

  7. Question 7· Air· WAEC

    Water vapour in air can be detected by

    Explanation and discussion

  9. Question 9· Air· WAEC

    Air is passed over heated copper turnings and the copper turns black. This is because

    Explanation and discussion

  10. Question 10· Air· WAEC

    Approximately what percentage of dry air by volume is oxygen?

    Explanation and discussion

  11. Question 11· Air· WAEC

    Which noble gas is used in advertising signs because it glows red when electricity passes through it?

    Explanation and discussion

  12. Question 12· Air· WAEC

    The noble gas used in advertising signs because it glows red is

    Explanation and discussion

  14. Question 14· Air· WAEC

    Air is regarded as a mixture rather than a compound because

    Explanation and discussion

  15. Question 15· Air· WAEC

    When air is passed over heated copper, the copper turns black because

    Explanation and discussion

  16. Question 16· Air· WAEC

    The component of air that supports burning is

    Explanation and discussion

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