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 1591:

  Which of the following is a unique property of water compared to other liquids?

  Options:
  A) It is a poor solvent
  B) It does not evaporate
  C) It expands when freezing
  D) It has a low heat capacity
  Show Answer
  The correct answer is C .
• Question 1592: A metal that forms soluble trioxosulphate (IV) ion is Options:
  A) barium
  B) potassium
  C) manganese
  D) aluminium
  Show Answer
  The correct answer is B .
• Question 1593: An example of a polysaccharides is? Options:
  A) —dextrose
  B) mannose
  C) glucose
  D) starch
  Show Answer
  The correct answer is D .
• Question 1594:

  How many moles of limestone will be required to produce 5.6g of CaO?

  [Ca = 40, C = 12, O= 16]

  Options:
  A) 0.20 mol
  B) 0.10 mol
  C) 1.12 mol
  D) 0.56 mol
  Show Answer
  The correct answer is B .
• Question 1595: In which of the following is the entropy change positive? Options:
  A) Thermal dissociation of ammonium chloride
  B) Reaction between an acid and a base
  C) Addition of concentrated acid to water
  D) Dissolution of sodium metal in water
  Show Answer
  The correct answer is A .
• Question 1596: The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is? Options:
  A) ionic
  B) covalent
  C) neutral
  D) co-ordinate
  Show Answer
  The correct answer is B .
• Question 1597:

  To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

  Options:
  A) 298K
  B) 546K
  C) 819K
  D) 1092K
  Show Answer
  The correct answer is D .
• Question 1598:

  Which of the following reactions would be expected to have the highest entropy change?

  Options:
  A) Liquid → Gas
  B) Solid → Liquid
  C) Gas → Liquid
  D) Gas → Solid
  Show Answer
  The correct answer is A .
• Question 1599: When excess chlorine is mixed with ethene at room temperature, the product is Options:
  A) 1,2 - dichloroethane
  B) 1,2 - dichloroethene
  C) 1,1 - dichloroethane
  D) 1, 1 - dichloroethene
  Show Answer
  The correct answer is A .
• Question 1600: The relative atomic mass of a naturally occurring lithium consisting of 90% Li and 10% Li is Options:
  A) 6.9
  B) 7.1
  C) 6.2
  D) 6.8
  Show Answer
  The correct answer is C .