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 201: 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 202: 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 203: Which experiment led to the measurement of the charge on an electron? Options:
  A) Mass spectrometric experiment
  B) Oil-drop experiment
  C) Scattering α - particles
  D) Discharge-tube experiment
  Show Answer
  The correct answer is B .
• Question 204:

  

  What is the IUPAC name for the hydrocarbon?

  Options:
  A) 2-ethyl-4-methylpent-2-ene
  B) 3,5-dimethylhex-3-ene
  C) 2,4-dimethylhex 3-ene
  D) 2-methyl-4-ethylpent-3-ene
  Show Answer
  The correct answer is A .
• Question 205: If the cost of electricity required to deposit 1 g of magnesium is ₦5.00, how much would it cost to deposit 10g of aluminium? Options:
  A) ₦10.00
  B) ₦27.00
  C) ₦44.44
  D) ₦66.67
  E) ₦33.33
  Show Answer
  The correct answer is D .
• Question 206: A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute? Options:
  A) HNO ₃ but soluble in ammonia solution
  B) HNO₃ and ammonia solution
  C) HCl but soluble in ammonia solution
  D) HCl and in ammonia solution
  Show Answer
  The correct answer is A .
• Question 207:

  The nucleus of an atom consists of?

  Options:
  A) Electrons and neutrons
  B) Electrons and protons
  C) Protons and neutrons
  D) None of the above
  Show Answer
  The correct answer is C .
• Question 208: It is difficult to achieve an orderly arrangement of the molecules of a gas because they Options:
  A) have no definite shape
  B) have little force of attraction between them
  C) can collide with one another in the container
  D) are too small in size
  Show Answer
  The correct answer is B .
• Question 209: An electron can be added to a halogen atom to form a halide ion with Options:
  A) 2 valence electrons
  B) 3 valence electrons
  C) 7 valence electrons
  D) 8 valence electrons
  Show Answer
  The correct answer is D .
• Question 210: 12 g of solid protassium chlorate (KCIO) were added to 40 g of water and heated to dissolve all the solid. As the solution cools, crystals of potassium chlorate at 66 ^oC. The solubility of potassium chlorate at 66 ^oC is therefore Options:
  A) 66
  B) 33
  C) 10
  D) 20
  E) 30
  Show Answer
  The correct answer is E .