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 81: Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid? Options:
  A) Lead
  B) Magnesium
  C) Cpper
  D) Gold
  Show Answer
  The correct answer is B .
• Question 82: Which of these reagents can confirm the presence of a triple bond? Options:
  A) Bromine water
  B) Acidified KMnO₄
  C) Copper (I) chloride
  D) Bromine gas
  Show Answer
  The correct answer is C .
• Question 83: The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is Options:
  A) Phosphorus-32
  B) Cobalt-60
  C) Carbon-14
  D) Iodine-131
  Show Answer
  The correct answer is B .
• Question 84:

  Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the

  Options:
  A) Acid
  B) Ester of alkanoic acid
  C) Alkali
  D) Alkanol
  Show Answer
  The correct answer is C .
• Question 85: Oil spillage in ponds and creeks can be cleaned up by? Options:
  A) burning off the oil layer
  B) spraying with detergent
  C) dispersal with compressed air
  D) spraying with hot water
  Show Answer
  The correct answer is B .
• Question 86:

  Which of the following is a primary constituent of crude oil?

  Options:
  A) Pentane
  B) Ethanol
  C) Heptane
  D) Methane
  Show Answer
  The correct answer is D .
• Question 87:

  NO_(g) + CO_(g) ↔ (1)/(2)N_2(g) + CO_2(g) ∆H = -89.3 kj.

  What conditions would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?

  Options:
  A) Low temperature and high pressure
  B) High temperature and low pressure
  C) High temperature and high pressure
  D) Low temperature and low pressure
  Show Answer
  The correct answer is A .
• Question 88: The function of conc. H₂SO₄ in the esterification of ethanoic acid with ethanol is to Options:
  A) serve as a dehydrating agent
  B) serve as a solvent
  C) act as a catalyst
  D) prevent any side reaction
  E) serve as an oxidizing agent
  Show Answer
  The correct answer is C .
• Question 89: Indicate which of the following statements is not true as we move from left to right along the periodic Table: Options:
  A) atomic number of elements increases
  B) atomic mass of elements increases
  C) electropositive character of elements increases
  D) electronegative character of elements increases
  E) number of electrons in the outermost orbits of element increases
  Show Answer
  The correct answer is C .
• Question 90: The industrial preparation of hydrogen gas from water gas is referred to as Options:
  A) Bosch process
  B) Contact process
  C) Haber process
  D) Bayer Process
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  The correct answer is A .