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JAMB and WAEC Chemistry questions

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

AllJAMBWAEC
All topicsAcids, bases and salts · 58Air · 37Atomic structure and bonding · 59Chemical combination · 58Chemical equilibrium · 37Chemistry and industry · 35Electrolysis · 41Energy changes · 38Environmental pollution · 32Kinetic theory of matter and gas laws · 45Metals and their compounds · 47Non-metals and their compounds · 45Organic compounds · 72Oxidation and reduction · 41Rates of chemical reaction · 38Separation of mixtures and purification · 42Solubility · 36Water · 39

  1. Question 161· Chemical combination· WAEC

    Pure water from any source always contains hydrogen and oxygen in the mass ratio 1 : 8. This illustrates the law of

    Explanation and discussion

  2. Question 162· Chemical combination· WAEC

    How many moles are in 9 g of water? (H = 1, O = 16)

    Explanation and discussion

  3. Question 163· Chemical combination· WAEC

    The law of conservation of mass states that in a chemical reaction

    Explanation and discussion

  4. Question 164· Chemical combination· WAEC

    How many moles are in 36 g of water? (H = 1, O = 16)

    Explanation and discussion

  5. Question 165· Chemical combination· WAEC

    The empirical formula of a compound whose molecular formula is C₂H₆ is

    Explanation and discussion

  6. Question 166· Chemical combination· WAEC

    In 2Mg + O₂ → 2MgO, how many moles of magnesium oxide are formed from 4 mol of magnesium?

    Explanation and discussion

  8. Question 168· Chemical combination· WAEC

    Calculate the mass of 0.2 mol of NaCl. (Na = 23, Cl = 35.5)

    Explanation and discussion

  9. Question 169· Chemical combination· JAMB

    The law of definite proportions states that

    Explanation and discussion

  10. Question 170· Chemical combination· JAMB

    How many molecules are in 2 mol of nitrogen gas? (Avogadro's constant = 6.02 × 10²³ mol⁻¹)

    Explanation and discussion

  11. Question 171· Chemical combination· JAMB

    What mass of sodium hydroxide is needed to prepare 250 cm³ of a 0.2 mol/dm³ solution? [Na = 23, O = 16, H = 1]

    Explanation and discussion

  12. Question 172· Chemical combination· WAEC

    In the equation 2H₂ + O₂ → 2H₂O, the mass of water formed from 4 g of hydrogen is

    Explanation and discussion

  13. Question 173· Chemical combination· WAEC

    When the equation aAl + bO₂ → cAl₂O₃ is balanced, a, b and c are

    Explanation and discussion

  14. Question 174· Chemical combination· WAEC

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

    Explanation and discussion

  15. Question 175· Chemical combination· JAMB

    What mass of carbon(IV) oxide is produced when 6 g of carbon burns completely in oxygen? (C = 12, O = 16)

    Explanation and discussion

  16. Question 176· Chemical combination· JAMB

    What mass of sodium chloride is formed when 46 g of sodium reacts completely with chlorine? (Na = 23, Cl = 35.5)

    Explanation and discussion

  17. Question 177· Chemical combination· JAMB

    What is the mass of 22.4 dm³ of carbon(IV) oxide at s.t.p.? (C = 12, O = 16)

    Explanation and discussion

  18. Question 178· Chemical combination· JAMB

    Gay-Lussac's law states that gases react in volumes that are

    Explanation and discussion

  19. Question 179· Chemical combination· JAMB

    How many moles of oxygen atoms are in 0.5 mol of carbon(IV) oxide?

    Explanation and discussion

  20. Question 180· Chemical combination· JAMB

    How many moles of oxygen atoms are present in 0.5 mol of CaCO₃?

    Explanation and discussion

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