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 881:

  Using the metal activity series, the metal that can liberate hydrogen gas from steam is?

  Options:
  A) iron
  B) copper
  C) tin
  D) lead
  Show Answer
  The correct answer is A .
• Question 882:

  With conc H₂SO₄ as catalyst

  CH₃COOH + C₂H₅OH → CH₃COOC₂H₅ + H₂O

  Options:
  A) esterification
  B) Condensation
  C) saponification
  D) neutralization
  Show Answer
  The correct answer is A .
• Question 883:

  If a given quantity of electricity liberates 0.65g of Zn²⁺, what amount of Hg²⁺ would be liberated by the same quantity of current?

  [Zn = 65, Hg = 201]

  Options:
  A) 1.00g
  B) 2.10g
  C) 4.02g
  D) 8.04g
  Show Answer
  The correct answer is B .
• Question 884: Pick out the correct statement Options:
  A) Zin heated to redness reacts with steam to give oxygen and zinc oxide
  B) Zinc heated to redness reacts with steam to give oxygen and hydrogen
  C) Zinc does not react with hot or cold water
  D) Zinc reacts with hot water to form zinc oxide and hydrogen
  E) Zinc reacts very easily with cold water to give zinc oxide and hydrogen
  Show Answer
  The correct answer is D .
• Question 885: Which of the following compounds can be represented by the molecular formula C₂H₆O? Options:
  A) Propanel
  B) Ethanol
  C) Methanoic acid
  D) Glucose
  Show Answer
  The correct answer is B .
• Question 886: The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM. Options:
  A) chlorine
  B) aluminium
  C) silicon
  D) magnesium
  E) sodium
  Show Answer
  The correct answer is B .
• Question 887: The idea of planetary electron was that of Options:
  A) Rutherford
  B) Thompson
  C) Bohr
  D) Dalton
  Show Answer
  The correct answer is A .
• Question 888: The hydrocarbon that burns in air with a sooty flames is Options:
  A) C₂H₆
  B) C₃H₈
  C) C₄H₁₀
  D) C₆H₆
  Show Answer
  The correct answer is D .
• Question 889: Which of the following roles does sodium chloride play in soap preparation? It Options:
  A) reacts with glycerol
  B) purifies the soap
  C) accelerates the decomposition of the fat or oil
  D) separates the soap from the glycerol
  E) converts the fatty acid to its sodium salt
  Show Answer
  The correct answer is D .
• Question 890:

  The presence of ammonia gas in a desiccator can exclusively be removed by

  Options:
  A) phosphorus (V) oxide
  B) fused calcium chloride
  C) calcium chloride
  D) concentrated tetraoxosulphate (VI) acid
  Show Answer
  The correct answer is D .