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 1:

  ${}_{11}^{11}Na{+}_0^{1}n{\to }_{11}^{24}Na$

  The reaction above is an example of

  Options:
  A) nuclear fission
  B) nuclear fusion
  C) artificial transmutation
  D) beta decay
  Show Answer
  The correct answer is C .
• Question 2: Copper and silver metals are commonly use as coin because they are Options:
  A) easily reduced
  B) not easily reduced
  C) easily oxidized
  D) not easily oxidized
  Show Answer
  The correct answer is D .
• Question 3: What is discharged at the cathode during the electrolysis of copper (ll) tetraoxosulphate (VI) solution? Options:
  A) Cu ²⁺ only
  B) H + only
  C) Cu ²⁺ and H
  D) Cu ²⁺ and SO ^2-
  Show Answer
  The correct answer is A .
• Question 4: The volume occupies by 1.58g of a gas at s.t.p is 500cm³. What is the relative molecular mass of the gas? (G.M.V at s.t.p = 22.40dm³) Options:
  A) 28
  B) 32
  C) 44
  D) 71
  Show Answer
  The correct answer is D .
• Question 5: Hydrogen sulphide gas can act as Options:
  A) an oxidizing agent
  B) a dehydrating agent
  C) a bleaching agent
  D) a precipitating agent
  Show Answer
  The correct answer is D .
• Question 6: Which of the following represents saponification? Options:
  A) Reaction of carboxylic acids with sodium hydroxide
  B) Reaction of alkanoates with acid
  C) Reaction of alkanoates with alcohols
  D) Reaction of alkanoates with sodium hydroxide
  Show Answer
  The correct answer is D .
• Question 7: There are basic particles from which matter called be made except Options:
  A) Salt
  B) Atom
  C) Ion
  D) Molecule
  Show Answer
  The correct answer is A .
• Question 8:

  Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.

  The relative abundance of the isotope of mass number 37 is?

  Options:
  A) 20
  B) 25
  C) 50
  D) 75
  Show Answer
  The correct answer is B .
• Question 9: 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 10:

  A chemical process in which there is a gain of electrons is known as?

  Options:
  A) Sublimation
  B) Reduction
  C) Oxidation
  D) Distillation
  Show Answer
  The correct answer is B .