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WAEC Chemistry questions

357 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 41· Air· WAEC

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

    Explanation and discussion

  2. Question 42· Air· WAEC

    The component of air that supports burning is

    Explanation and discussion

  3. Question 43· Atomic structure and bonding· WAEC

    The type of bond formed between sodium and chlorine is

    Explanation and discussion

  4. Question 44· Atomic structure and bonding· WAEC

    The bond between sodium and chlorine in sodium chloride is

    Explanation and discussion

  5. Question 45· Atomic structure and bonding· WAEC

    Element X is in Group II and Period 3 of the Periodic Table. X is

    Explanation and discussion

  6. Question 46· Atomic structure and bonding· WAEC

    Chlorine consists of ³⁵Cl (75%) and ³⁷Cl (25%). Calculate its relative atomic mass.

    Explanation and discussion

  7. Question 47· Atomic structure and bonding· WAEC

    Which of these compounds is covalent?

    Explanation and discussion

  8. Question 48· Atomic structure and bonding· WAEC

    The bond formed when both shared electrons come from one atom is

    Explanation and discussion

  9. Question 49· Atomic structure and bonding· WAEC

    Which pair of elements is most likely to form an ionic compound?

    Explanation and discussion

  10. Question 50· Atomic structure and bonding· WAEC

    An atom has atomic number 11 and mass number 23. The number of neutrons in it is

    Explanation and discussion

  11. Question 51· Atomic structure and bonding· WAEC

    Sodium chloride has a high melting point because of

    Explanation and discussion

  12. Question 52· Atomic structure and bonding· WAEC

    An atom of chlorine has mass number 37 and atomic number 17. How many neutrons does it contain?

    Explanation and discussion

  13. Question 53· Atomic structure and bonding· WAEC

    Isotopes of an element differ in their number of

    Explanation and discussion

  14. Question 54· Atomic structure and bonding· WAEC

    The number of protons in an atom is its

    Explanation and discussion

  15. Question 55· Atomic structure and bonding· WAEC

    The electronic configuration of an atom with atomic number 12 is

    Explanation and discussion

  16. Question 56· Atomic structure and bonding· WAEC

    The negatively charged particle in an atom is the

    Explanation and discussion

  17. Question 57· Atomic structure and bonding· WAEC

    Chlorine, bromine and iodine have similar chemical properties because they have the same number of

    Explanation and discussion

  18. Question 58· Atomic structure and bonding· WAEC

    The bond between hydrogen and chlorine in a hydrogen chloride molecule is

    Explanation and discussion

  19. Question 59· Atomic structure and bonding· WAEC

    Across a period from left to right, atomic radius

    Explanation and discussion

  20. Question 60· Atomic structure and bonding· WAEC

    An atom with 11 protons and 12 neutrons has a mass number of

    Explanation and discussion

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