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 441: Which of the following statements is NOT true of carbon monoxide? Options:
  A) CO is poisonous
  B) CO is readily oxidized at room temperature by air to form CO₂
  C) CO may be prepared by reducing CO₂ mixed with coke heated to about 1000^oC
  D) CO may be prepared by heating charcoal with a limited amount of O₂
  E) CO is a good reducing agent
  Show Answer
  The correct answer is B .
• Question 442: The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as? Options:
  A) Brownian movement
  B) condensation
  C) evaporation
  D) liquefaction
  Show Answer
  The correct answer is C .
• Question 443:

  

  The elections or two atoms Y and Z are arranged in shes as shown above. The bond formed between the atoms of Y and Z is

  Options:
  A) ionic
  B) convalent
  C) dative
  D) metallic
  Show Answer
  The correct answer is B .
• Question 444: An example of a secondary amine is? Options:
  A) propylene
  B) di-butylamine
  C) methylamine
  D) trimethylamine
  Show Answer
  The correct answer is B .
• Question 445:

  

  The IUPAC name for

  Options:
  A) 2-methylbutanoic acid
  B) 2-methyl-1- hydroxyketone
  C) 2-methyl-1-hydroxy aldehyde
  D) 2-methylpentanoic acid
  Show Answer
  The correct answer is A .
• Question 446: Which of the following compound is a normal salt? Options:
  A) NaHS
  B) NaHSO₄
  C) NaHCO₃
  D) Na₂CO₃
  Show Answer
  The correct answer is D .
• Question 447: The acid that is used to remove rust is Options:
  A) boric
  B) hydrochloric
  C) trioxonitrate (V)
  D) tetraoxosulphate (VI)
  Show Answer
  The correct answer is B .
• Question 448: The acid in electrolysis of water is dilute Options:
  A) HNO₃
  B) CH₃COOH
  C) H₂SO
  D) HCl
  Show Answer
  The correct answer is C .
• Question 449:

  

  The IUPAC nomenclature for the compound above is

  Options:
  A) 4-methylpent-1-ene
  B) 3-methylpent-2-ene
  C) 2-methylpent-1ene
  D) 2-methylpent-4-ene
  Show Answer
  The correct answer is A .
• Question 450:

  2H₂O _(l) + 2F_2(g) → 4HF_(aq) + O_2(g).

  In the reaction above, the substance that is being reduced is

  Options:
  A) O_2(g)
  B) H₂O_(l)
  C) F_2(g)
  D) HF_(aq)
  Show Answer
  The correct answer is C .