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 41: Which of the following conduct electricity? Options:
  A) sulfur
  B) graphite
  C) diamond
  D) red phosphorus
  E) yellow phosphorus
  Show Answer
  The correct answer is B .
• Question 42: The reaction that takes place in Daniell cell is Options:
  A) direct combination
  B) redox
  C) double decomposition
  D) neutralization
  Show Answer
  The correct answer is B .
• Question 43: The density of a certain gas is 1.98gdm^-3 at s.t.p. What is the molecular mas of the gas? Options:
  A) 44.0 g
  B) 54.0 g
  C) 26.0 g
  D) 31.0 g
  Show Answer
  The correct answer is A .
• Question 44: When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of Options:
  A) calcium tetraoxosulphate(VI)
  B) calcium trioxocarbonate (IV)
  C) calcium hydrogentrioxocarbonate (IV)
  D) aluminium trioxocarbonate (IV)
  Show Answer
  The correct answer is B .
• Question 45:

  What is the solubility product constant (Ksp) used for?

  Options:
  A) To measure the total mass of a solute that can dissolve in a solvent
  B) To determine the concentration of a solute in a saturated solution
  C) To calculate the solubility of a solute in a given solvent
  D) To compare the solubilities of different solutes in the same solvent
  Show Answer
  The correct answer is B .
• Question 46: Which of the following compounds can exist as geometric isomers? Options:
  A) 2-methylbut-2ene
  B) But-2-ene
  C) But-1-ene
  D) CI-C-Br
  Show Answer
  The correct answer is B .
• Question 47:

  Which of the following substances is a mixture?

  Options:
  A) Granulated sugar
  B) Seawater
  C) Sodium chloride
  D) Iron filling
  Show Answer
  The correct answer is B .
• Question 48: The process that occurs when two equivalent forms of a compound are in equilibrium is Options:
  A) Isotopy
  B) Resonance
  C) Isomerism
  D) Reforming
  Show Answer
  The correct answer is B .
• Question 49:

  Zn + 2HCL ZnCl${}_2$ + H${}_2$

  What happens to zinc in the above reaction?

  Options:
  A) oxidized
  B) a reactant
  C) reduced
  D) a metal
  Show Answer
  The correct answer is A .
• Question 50: At 25^oC and 1atm, a gas occupies a volume of 1.50dm³. What volume will it occupy at 100^oC and 1atm? Options:
  A) 1.88 dm³
  B) 6.00 dm³
  C) 18.80 dm³
  D) 18.80 dm³
  E) 60.00dm³
  Show Answer
  The correct answer is A .