Chemistry Exam Past Questions and Answers | JAMB, WAEC and NECO

Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.

• Question 451: Haematite is an ore of Options:
  A) zinc
  B) lead
  C) iron
  D) copper
  Show Answer
  The correct answer is C .
• Question 452: The monomer of nylon is Options:
  A) Hydroxybenzene
  B) Hexanedioic acid
  C) Benzene -1,-4-dicarboxylic acid
  D) Ethane-1,2-diol
  Show Answer
  The correct answer is B .
• Question 453:

  Equal volumes of CO,SO₂, and H₂S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?

  (S = 32, C = 12, O = 16, N = 14, H = 1)

  Options:
  A) CO, SO₂,NO₂,H₂S
  B) SO₂,NO₂,H₂S,CO
  C) CO,H₂S,SO₂,NO₂
  D) CO,H₂S,NO₂,SO₂
  Show Answer
  The correct answer is D .
• Question 454: When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are; Options:
  A) nitrogen and carbondioxide
  B) the rare gases
  C) nitrogen and oxygen
  D) nitrogen and the rare gases
  E) nitrogen, carbondioxide and the rare gases
  Show Answer
  The correct answer is D .
• Question 455: The dispersion of a liquid in a liquid medium will give Options:
  A) an emulsion
  B) a fog
  C) a gel
  D) an aerosol
  Show Answer
  The correct answer is A .
• Question 456: Which of the following substances is a mixture? Options:
  A) Sulphur powder
  B) Bronze
  C) Distilled water
  D) Ethanol
  Show Answer
  The correct answer is B .
• Question 457: A metal M displaces zinc from zinc chloride solution. This shows that Options:
  A) M is more electronegative than zinc
  B) Zinc is above hydrogen in the series
  C) M is more electropositive than zinc
  D) Electrons flow from zinc to M
  Show Answer
  The correct answer is C .
• Question 458:

  An organic compound X has the following properties:
  I. It is not miscible with water.
  ll. It has boiling point of 77^oC.
  lll. It has a sweet odour.
  IV. lt is insoluble in sodium hydrogen carbonate solution.
  V lt does not decolourize bromine water.
  X is therefore

  Options:
  A) methane
  B) ethanoic acid
  C) ethene
  D) ethyl ethanoate
  E) carbon tetrachloride
  Show Answer
  The correct answer is D .
• Question 459:

  What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution?

  [Na=23, O=16, H=1]

  Options:
  A) 0.05 moldm^-3
  B) 0.30 moldm^-3
  C) 0.50 moldm^-3
  D) 0.40 moldm^-3
  Show Answer
  The correct answer is C .
• Question 460: A particle that contains 9 protons, 10 neutrons and 10 electrons is a Options:
  A) negative ion
  B) positive ion
  C) neutral atom of non-metal
  D) neutral atom of a metal
  Show Answer
  The correct answer is A .