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 1801: Which of the following is NOT a true statement of the kinetic Theory of Gases? Options:
  A) The molecules move at random
  B) The size of molecules is negligble as compared with the volume of gas
  C) The molecular collisions are perfectly elastic
  D) Every molecule has the same kinetic energy at a particular temperature
  E) The average kinetic energy is proportional to the absolute temperature of the gas
  Show Answer
  The correct answer is D .
• Question 1802: An example of oxidation - reduction enzyme is Options:
  A) amylase
  B) protease
  C) lipase
  D) dehydrogenase
  Show Answer
  The correct answer is D .
• Question 1803:

  2Na_(s) + 2H₂O_(l) → 2NaOH_(aq) + H_2(g)

  From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.

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

  Options:
  A) 0.40g
  B) 0.80g
  C) 4.00g
  D) 8.00g
  Show Answer
  The correct answer is C .
• Question 1804: An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia. Therefore cartion in M is Options:
  A) Zn ⁺⁺
  B) Ca⁺⁺
  C) Ai⁺⁺⁺
  D) Pb⁺⁺
  E) Cu⁺⁺
  Show Answer
  The correct answer is A .
• Question 1805:

  Which of the following methods can be used to remove temporary hardness from water?

  Options:
  A) Boiling
  B) Filtration
  C) sedimentation
  D) Chlorination
  Show Answer
  The correct answer is A .
• Question 1806:

  What is the chemical structure of soap and detergent molecules?

  Options:
  A) Hydrophilic head and hydrophobic tail
  B) Hydrophilic head and hydrophilic tail
  C) Hydrophobic head and hydrophobic tail
  D) Hydrophilic tail and hydrophobic head
  Show Answer
  The correct answer is A .
• Question 1807:

  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 1808:

  

  The IUPAC name for

  Options:
  A) 1-methlpentane
  B) 3-methylbutane
  C) 2-methylbutane
  D) 1-dimethylpropane
  E) 2-methylpentane
  Show Answer
  The correct answer is C .
• Question 1809:

  

  Choose the correct answer in the option above.

  Which of the following is a primary amine?

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 1810: Water can be identified by the use of? Options:
  A) anhydrous copper (II) tetraoxosulphate (VI)
  B) anhydrous sodium trioxocarbonate (IV)
  C) potassium heptaoxochromate (VII)
  D) copper (II) trioxocaronate (IV)
  Show Answer
  The correct answer is A .