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 1961: A consequence of global warming is Options:
  A) air pollution
  B) water pollution
  C) increased humudity
  D) flooding
  Show Answer
  The correct answer is D .
• Question 1962: 10cm³ of CO is mixed and sparked with 100cm³ of air containing 21% O₂. If all the volumes measured at S.T.P. the volume of resulting gases would be? Options:
  A) 90cm³
  B) 100cm³
  C) 105cm³
  D) 110cm³
  E) 115cm³
  Show Answer
  The correct answer is C .
• Question 1963: MnO^-₄ + 8H⁺ + ne → Mn⁺⁺ + 4H₂O. Which is the value of n in the reaction above? Options:
  A) 2
  B) 3
  C) 4
  D) 5
  Show Answer
  The correct answer is D .
• Question 1964: In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity? Options:
  A) Ethanoic acid, milk or magnesia, sodium chloride, hydrochloric acid and sodium hydroxide
  B) Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium chloride and sodium hydroxide
  C) Hydrochloride acid, ethanol acid, sodium chloride, milk of magnesia and sodium hydroxide
  D) Hydrochloride acid, sodium hydroxide sodium chloride, ethanol acid, and milk of magnesia
  Show Answer
  The correct answer is C .
• Question 1965: Which of the following atoms represents deuterium? Options:
  A) No protons = 1, No of neutrons = 0, No of electrons = 0
  B) No protons = 1, No of neutrons = 0, No of electrons = 1
  C) No protons = 1, No of neutrons = 1, No of electrons = 1
  D) No protons = 1, No of neutrons = 2, No of electrons = 1
  Show Answer
  The correct answer is C .
• Question 1966: Which of the following processes NOT lead to a chemical change? Options:
  A) Strirring iron in sulphur (IV) acid
  B) Stirring sodium carbonate in water
  C) Stirring glucose in concentrated sulphur (IV) acid
  D) Mixing sulphur (IV) acid with potassium carbonate
  E) Titrating an acid against base
  Show Answer
  The correct answer is B .
• Question 1967:

  The two ions responsible for hardness in water are

  Options:
  A) Ca${}^{2+}$ and / or Mg${}^{2+}$
  B) K${}^{+}$ and / or Mg${}^{2+}$
  C) Ca${}^{2+}$ and / or Li${}^{+}$
  D) Ca${}^{2+}$ and / or Na${}^{+}$
  Show Answer
  The correct answer is A .
• Question 1968: Which of the following mixture of gases is likely to burn in flame Options:
  A) neon and hydrogen
  B) nitrogen and helium
  C) helium and neon
  D) neon and nitrogen
  Show Answer
  The correct answer is A .
• Question 1969: Which of the following pairs of substance will react further with oxygen to form a higher oxide? Options:
  A) CO₂ and H₂O
  B) NO and H₂O
  C) CO and CO₂
  D) SO₂ and NO
  Show Answer
  The correct answer is D .
• Question 1970: Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series? Options:
  A) Copper
  B) Iron
  C) Lead
  D) Potassium
  E) Zinc
  Show Answer
  The correct answer is D .