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Chemistry WAEC Past Questions

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1906

The gas that is less dense than air is

  • A. nitrogen
  • B. chlorine
  • C. Carbon(IV) oxide
  • D. Oxygen
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1907

The periodic property that is used to determine whether a covalent molecule is polar or not is

  • A. atomic radius
  • B. ionization energy
  • C. electron affinity
  • D. electronegativity
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1908

If \(100^3\) of a saturated solution of sodium tetraoxosulphate (VI) at 30° C contains 10.5 g of the salt, what would be its solubility at this temperature? [(\(Na_2SO_4\) = 142]

  • A. 2.15 mol dm-3
  • B. 0.74 mol dm-3
  • C. 0.60 mol dm-3
  • D. 0.57 mol dm-3
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1909

A compound that could be dried by using conc. tetraoxosulphate (VI) acid and not by calcium oxide is likely to be

  • A. a deliquescent salt
  • B. a neutral salt
  • C. an alkaline gas
  • D. an acid anhydride
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1910

Which of the statements about gases is not correct?

  • A. Gases have low densities compared to solids and liquids of equal mass.
  • B. The total kinetic energy of the gas is not affected by collision
  • C. Molecules of the gas are in constant motion
  • D. Gases are highly soluble in water at high temperatures
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