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WAEC Chemistry questions

357 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· Acids, bases and salts· WAEC

    A solution with pH 9 is

    Explanation and discussion

  2. Question 2· Acids, bases and salts· WAEC

    Baking soda used in cooking is

    Explanation and discussion

  3. Question 3· Acids, bases and salts· WAEC

    Hydrated salts lose water of crystallisation on exposure to air. This is

    Explanation and discussion

  4. Question 4· Acids, bases and salts· WAEC

    A salt formed when only part of the replaceable hydrogen of an acid is replaced by a metal is

    Explanation and discussion

  5. Question 5· Acids, bases and salts· WAEC

    Which of these is a weak acid?

    Explanation and discussion

  6. Question 6· Acids, bases and salts· WAEC

    An acid salt is formed when

    Explanation and discussion

  7. Question 7· Acids, bases and salts· WAEC

    25 cm³ of 0.1 mol/dm³ NaOH is neutralised by 20 cm³ of HCl. The concentration of the acid is

    Explanation and discussion

  8. Question 8· Acids, bases and salts· WAEC

    The pH of a 0.01 mol/dm³ solution of HCl is

    Explanation and discussion

  9. Question 9· Acids, bases and salts· WAEC

    An aqueous solution of pH 12 is

    Explanation and discussion

  10. Question 10· Acids, bases and salts· WAEC

    A solution of household bleach has a pH of 12. It is

    Explanation and discussion

  11. Question 11· Acids, bases and salts· WAEC

    According to Brønsted-Lowry, an acid is a

    Explanation and discussion

  12. Question 12· Acids, bases and salts· WAEC

    The reaction of an acid with a base to form a salt and water only is called

    Explanation and discussion

  13. Question 13· Acids, bases and salts· WAEC

    25.0 cm³ of 0.10 mol/dm³ sodium hydroxide is exactly neutralised by 20.0 cm³ of hydrochloric acid. Find the concentration of the acid.

    Explanation and discussion

  14. Question 14· Acids, bases and salts· WAEC

    A farmer adds lime to his soil in order to

    Explanation and discussion

  15. Question 15· Acids, bases and salts· WAEC

    The reaction between an acid and a base to form salt and water only is called

    Explanation and discussion

  16. Question 16· Acids, bases and salts· WAEC

    A solution with a pH of 12 is

    Explanation and discussion

  17. Question 17· Acids, bases and salts· WAEC

    What is the basicity of tetraoxophosphate(V) acid, H₃PO₄?

    Explanation and discussion

  18. Question 18· Acids, bases and salts· WAEC

    A suitable indicator for titrating a strong acid with a weak base is

    Explanation and discussion

  19. Question 19· Acids, bases and salts· WAEC

    Lemon juice tastes sour because it contains

    Explanation and discussion

  20. Question 20· Acids, bases and salts· WAEC

    Which of these is a basic oxide?

    Explanation and discussion

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