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 1061: For iodine crystals to sublime on heating, the molecules must acquire energy that is? Options:
  A) less than the forces odf attraction in the solid
  B) equal to the forces of attraction in th solid
  C) necessary to melt the solid
  D) greater than the forces of attraction in both the solid and the liquid phases
  Show Answer
  The correct answer is D .
• Question 1062: Which of the following dilute solutions has the lowest pH value? Options:
  A) Calcium trioxocarbonate (IV)
  B) Sodium trioxocarbonate (IV)
  C) Hydrochloric acid
  D) Ethanoic acid
  Show Answer
  The correct answer is C .
• Question 1063:

  The hydrogen ion concentration of a sample of orange juice is $2.0\times {10}^{-11}$ moldm${}^{-3}$. What is its p${}^{\text{OH}}$? $\log {10}^2=0.3010$

  Options:
  A) 3.30
  B) 13.00
  C) 10.70
  D) 11.30
  Show Answer
  The correct answer is A .
• Question 1064:

  

  In the diagram above, the purpose of the asbestos to

  Options:
  A) absorb impurities
  B) catalyze the reaction
  C) solidify the gas
  D) dry the gas
  Show Answer
  The correct answer is B .
• Question 1065: The drying agent suitable for drying ammonia is Options:
  A) Calcium Chloride
  B) Calcium Oxide
  C) Phosphorus(V) Oxide
  D) Concentrated H₂SO₄
  Show Answer
  The correct answer is B .
• Question 1066: The alkanol obtained from the production of soap is Options:
  A) propanol
  B) ethanol
  C) glycerol
  D) methanol
  Show Answer
  The correct answer is C .
• Question 1067: The air pollutant unknown in nature is Options:
  A) NO
  B) CO
  C) HCHO
  D) DDT
  Show Answer
  The correct answer is D .
• Question 1068:

  The process of rusting is an example of the formation of

  Options:
  A) Basic oxide
  B) Acidic oxide
  C) Reducing oxide
  D) Amphoteric oxide
  Show Answer
  The correct answer is A .
• Question 1069: Vulcanization involves the removal of Options:
  A) A monomer
  B) The single bond
  C) The double bond
  D) A polymer
  Show Answer
  The correct answer is C .
• Question 1070: The chemical reaction which takes place at the anode (positive electrode) in electrolysis is? Options:
  A) oxidation
  B) hydrolysis
  C) dissociation
  D) reduction
  E) disproportionation
  Show Answer
  The correct answer is A .