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:

  3Cu_(s) + 8HNO_3(aq) 3Cu(NO₃)_2(aq) + 4H₂O_(l) + 2NO_(g)

  In the equation above, copper is

  Options:
  A) an electron acceptor
  B) a base
  C) an oxidizing agent
  D) a reducing agent
  Show Answer
  The correct answer is D .
• Question 1962:

  ₁²D + ₁³T → ₂⁴He + ₀¹n + energy

  The reaction above illustrates

  Options:
  A) alpha decay
  B) artificial transmutation
  C) nuclear fussion
  D) nuclear fission
  Show Answer
  The correct answer is C .
• Question 1963: Which of the following is a physical change? Options:
  A) The bubbling of chlorine into water
  B) The bubbling of chlorine into a jar contanining hydrogen
  C) The dissolution of sodium chloride in water
  D) The passing of steam over heated iron
  Show Answer
  The correct answer is C .
• Question 1964: A burning candle produces water and Options:
  A) Carbon (II) oxide
  B) Carbon (IV) oxide
  C) Oxygen
  D) Hydrogen
  Show Answer
  The correct answer is B .
• Question 1965:

  When an acidic solution is diluted, what happens to its pH?

  Options:
  A) It depends on the specific acid
  B) It decreases
  C) It remains the same
  D) It increases
  Show Answer
  The correct answer is D .
• Question 1966:

  Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

  Options:
  A) which contains protons and neutrons
  B) which is positively charged
  C) which is massive and can cause deflection of a few projectiles
  D) which is very large and in which close to 98% of projectiles pass undeflected
  Show Answer
  The correct answer is C .
• Question 1967: The noble gas, argon, is used for Options:
  A) electrical arc welding
  B) welding brass
  C) underwater welding
  D) steel-welding
  Show Answer
  The correct answer is A .
• Question 1968: 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 1969: Phenolphthalein in acidic solution is Options:
  A) red
  B) orange
  C) colourless
  D) yellow
  Show Answer
  The correct answer is C .
• Question 1970:

  Cr₂O$\frac{2-}{7}$ (aq) + H₂O(1)⇌ 2CrO $\frac{2-}{4}$ (aq) + 2H ⁺ (aq)

  What happens to the reaction above when the hydrogen ion concentration is increased?

  Options:
  A) more of the products will be formed
  B) the reaction will not proceed
  C) the equilibrium position will shift to the right
  D) the equilibrium position will shift to the left.
  Show Answer
  The correct answer is D .