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WAEC Chemistry questions: Water

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

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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· Water· WAEC

    A deliquescent substance

    Explanation and discussion

  2. Question 2· Water· WAEC

    Water from a well tastes better than distilled water because it contains

    Explanation and discussion

  3. Question 3· Water· WAEC

    Which substance is added during public water treatment to kill germs?

    Explanation and discussion

  4. Question 4· Water· WAEC

    Hard water is undesirable for washing because it

    Explanation and discussion

  5. Question 5· Water· WAEC

    The formula of water shows that it contains hydrogen and oxygen in the ratio, by atoms, of

    Explanation and discussion

  6. Question 6· Water· WAEC

    A test for pure water is that it

    Explanation and discussion

  7. Question 7· Water· WAEC

    Anhydrous copper(II) sulphate is used to test for water because it turns from

    Explanation and discussion

  8. Question 8· Water· WAEC

    In water treatment, alum is added to

    Explanation and discussion

  9. Question 9· Water· WAEC

    Temporary hardness in water is caused by dissolved

    Explanation and discussion

  10. Question 10· Water· WAEC

    Boiling removes temporary hardness because calcium hydrogencarbonate

    Explanation and discussion

  11. Question 11· Water· WAEC

    Temporary hardness of water can be removed by

    Explanation and discussion

  12. Question 12· Water· WAEC

    In water treatment, the water is passed through sand beds in order to

    Explanation and discussion

  13. Question 13· Water· WAEC

    The test for water is that it turns anhydrous copper(II) sulphate

    Explanation and discussion

  14. Question 14· Water· WAEC

    Rain water is the purest natural water, but it may contain dissolved

    Explanation and discussion

  15. Question 15· Water· WAEC

    Which of the following methods removes temporary hardness of water but not permanent hardness?

    Explanation and discussion

  16. Question 16· Water· WAEC

    Permanent hardness can be removed by adding

    Explanation and discussion

  17. Question 17· Water· WAEC

    Caustic soda pellets left open in the laboratory become wet and finally form a solution. They are

    Explanation and discussion

  18. Question 18· Water· WAEC

    White anhydrous copper(II) tetraoxosulphate(VI) turns blue when it

    Explanation and discussion

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