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 1691: An emulsion paint consists of ? Options:
  A) gas or liquid particles dispersed in liguid
  B) liquid particles dispersed in liquid
  C) solid particles dispersed in liquid
  D) solid particles dispersed in solid
  Show Answer
  The correct answer is B .
• Question 1692: What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm³ of 0.05 M acid? Options:
  A) 0.05 dm³
  B) 0.10 dm³
  C) 0.55 dm³
  D) 11.0 dm³
  Show Answer
  The correct answer is A .
• Question 1693: Soap lather is an example of a colloid in which a? Options:
  A) liquid is dispersed in gas
  B) solid is dispersed in liquid
  C) gas is dispersed in liquid
  D) liquid is despersed in liquid
  Show Answer
  The correct answer is C .
• Question 1694:

  

  The set-up above would be useful for determining the amount of

  Options:
  A) oxygen in air
  B) water vapour in air
  C) CO₂ in air
  D) arygen in air
  Show Answer
  The correct answer is B .
• Question 1695: Helium is often used in observation balloons because it is? Options:
  A) light and combustible
  B) light and non-combustible
  C) heavy and combustible
  D) heavy and non-combustible
  Show Answer
  The correct answer is B .
• Question 1696: The air around a petroleum refinery is most likely to contain? Options:
  A) CO₂, SO₃ and N₂O
  B) CO₂, CO and N₂O
  C) SO₂, CO and NO₂
  D) PH₃ H₂O and CO₂
  Show Answer
  The correct answer is C .
• Question 1697: Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask? Options:
  A) N₂O and steam
  B) NO₂ and ammonia
  C) N₂O₂ and NO₂
  D) NO and NO₂
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  The correct answer is A .
• Question 1698: The monomer of nylon is Options:
  A) Hydroxybenzene
  B) Hexanedioic acid
  C) Benzene -1,-4-dicarboxylic acid
  D) Ethane-1,2-diol
  Show Answer
  The correct answer is B .
• Question 1699: Chlorine is produced commercially by? Options:
  A) electrolysis of dilute hydrochloric acid
  B) electrolysis of brine
  C) neutralization of hydrogen chloride
  D) heating potassium trioxochlorate (V)
  Show Answer
  The correct answer is B .
• Question 1700: Which of the following statements is FALSE? Options:
  A) Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
  B) Sodium metal dissolves in water giving oxygen
  C) Nitrogen is insoluble in water
  D) Carbondioxide is soluble in water
  E) lead has a higher atomic weight than copper
  Show Answer
  The correct answer is B .