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: Which of the following is a measure of the average kinetic energy of the molecules of a substance? Options:
  A) Volume
  B) Mass
  C) Pressure
  D) Temperature
  Show Answer
  The correct answer is D .
• Question 2: which of the following metals will show the highest metallic character? Options:
  A) Zinc
  B) Copper
  C) Barium
  D) Calcium
  Show Answer
  The correct answer is D .
• Question 3: A property of a colloidal dispersion which a solution does not have is? Options:
  A) the Tyndall effect
  B) homogeneity
  C) osmotic pressure
  D) surface polarity
  Show Answer
  The correct answer is A .
• Question 4:

  Consider the following exothermic reaction

  2SO_2(g) + O_2(g) ↔ 2SO_3(g)

  If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

  Options:
  A) the reaction rate increases
  B) concentration of SO₃ decreases
  C) concentration of SO₃ increases
  D) SO₂ gas becomes unreactive
  E) O₃ gas becomes unreactive
  Show Answer
  The correct answer is C .
• Question 5: What mass of sodium carbonate solution is in 500 cm³ of 0.1 molar sodium carbonate solution?(Na = 23, C = 12, O = 16) Options:
  A) 10.6 g
  B) 5.3 g
  C) 500 g
  D) 10 g
  E) 20 g
  Show Answer
  The correct answer is B .
• Question 6: Calculate the number of moles of HCl present in 20cm³ of a 0.75M solution of the acid Options:
  A) 0.015 mole
  B) 0.038 mole
  C) 3.800 moles
  D) 1.500 moles
  Show Answer
  The correct answer is A .
• Question 7: An anhydride is an oxide of non-mental? Options:
  A) which will not dissolve in water
  B) whose solution in water has a pH greater than 7
  C) whose solution in water has a pH less than 7
  D) whose solution in water has a pH of 7
  Show Answer
  The correct answer is C .
• Question 8: The colour of litmus in an alkaline medium is Options:
  A) Red
  B) Yellow
  C) Pink
  D) Blue
  Show Answer
  The correct answer is D .
• Question 9: Which of these reagents can confirm the presence of a triple bond? Options:
  A) Hypochlorous acid
  B) Bromine water
  C) Acidified KMnO4
  D) Copper I chloride
  Show Answer
  The correct answer is D .
• Question 10:

  How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm³ of 6M HCl?
  (Mg = 24, H = 1, Cl = 35.5)

  Options:
  A) 1.2 g
  B) 0.7 g
  C) 0.5 g
  D) 0.3 g
  E) 0.12 g
  Show Answer
  The correct answer is C .