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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 81· Chemical combination· WAEC

    A hydrocarbon contains 85.7% carbon by mass (C = 12, H = 1). Its empirical formula is

    Explanation and discussion

  2. Question 82· Chemical combination· WAEC

    A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass. Find its empirical formula. [C = 12, H = 1, O = 16]

    Explanation and discussion

  3. Question 83· Chemical combination· WAEC

    The relative molecular mass of CO₂ is (C = 12, O = 16)

    Explanation and discussion

  4. Question 84· Chemical combination· WAEC

    The volume of 2 mol of an ideal gas at s.t.p. is

    Explanation and discussion

  5. Question 85· Chemical combination· WAEC

    The percentage of water of crystallisation in CuSO₄·5H₂O (Cu = 64, S = 32, O = 16, H = 1) is

    Explanation and discussion

  6. Question 86· Chemical combination· WAEC

    Avogadro's number of particles is

    Explanation and discussion

  7. Question 87· Chemical combination· WAEC

    How many atoms are present in 0.5 mol of sulphur? [L = 6.02 × 10²³]

    Explanation and discussion

  8. Question 88· Chemical combination· WAEC

    The formula of calcium chloride is

    Explanation and discussion

  9. Question 89· Chemical combination· WAEC

    What mass of calcium oxide is formed by heating 50 g of calcium trioxocarbonate(IV) to constant mass? [Ca = 40, C = 12, O = 16]

    Explanation and discussion

  10. Question 90· Chemical combination· WAEC

    What is the relative molecular mass of CO₂? (C = 12, O = 16)

    Explanation and discussion

  11. Question 91· Chemical combination· WAEC

    Elements combine in a fixed ratio by mass to form a particular compound. This is the law of

    Explanation and discussion

  12. Question 92· Chemical combination· WAEC

    The number of moles in 4.4 g of CO₂ (C = 12, O = 16) is

    Explanation and discussion

  13. Question 93· Chemical combination· WAEC

    How many moles are there in 9.8 g of tetraoxosulphate(VI) acid, H₂SO₄? [H = 1, S = 32, O = 16]

    Explanation and discussion

  14. Question 94· Chemical combination· WAEC

    The mass of 0.5 mol of NaOH (Na = 23, O = 16, H = 1) is

    Explanation and discussion

  15. Question 95· Chemical combination· WAEC

    Calculate the percentage by mass of nitrogen in NH₃. (N = 14, H = 1)

    Explanation and discussion

  16. Question 96· Chemical equilibrium· WAEC

    For CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g), increasing the pressure

    Explanation and discussion

  17. Question 97· Chemical equilibrium· WAEC

    For 2SO₂ + O₂ ⇌ 2SO₃ (exothermic), lowering the temperature

    Explanation and discussion

  18. Question 98· Chemical equilibrium· WAEC

    For N₂ + 3H₂ ⇌ 2NH₃, removing ammonia as it forms

    Explanation and discussion

  19. Question 99· Chemical equilibrium· WAEC

    In the Contact process, the catalyst used is

    Explanation and discussion

  20. Question 100· Chemical equilibrium· WAEC

    Raising the temperature of an exothermic reaction at equilibrium shifts the equilibrium

    Explanation and discussion

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