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 771:

  Which of the following is a unique property of water compared to other liquids?

  Options:
  A) It is a poor solvent
  B) It does not evaporate
  C) It expands when freezing
  D) It has a low heat capacity
  Show Answer
  The correct answer is C .
• Question 772: As the concentration of an electrolyte reduces, the conductivity Options:
  A) reduces to zero
  B) decreases
  C) increase
  D) is unaffected
  Show Answer
  The correct answer is C .
• Question 773:

  What is the principal ore of iron, from which iron is extracted?

  Options:
  A) Calcite
  B) Bauxite
  C) Magnetite
  D) Hematite
  Show Answer
  The correct answer is D .
• Question 774:

  Which of the following represents the kind of bonding present in ammonium chloride?

  Options:
  A) ionic only
  B) covalent only
  C) ionic and dative covalent
  D) dative covalent
  Show Answer
  The correct answer is C .
• Question 775: Ammonia gas is normally dried with? Options:
  A) concentrated sulphuric acid
  B) quicklime
  C) anhydrous calcium chloride
  D) magnesium sulphate
  Show Answer
  The correct answer is B .
• Question 776:

  16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20^oC, calculate the solubility of the solute in moldm-³

  [Pb = 207, N = 14, O = 16]

  Options:
  A) 0.05 g
  B) 2.00 g
  C) 1.00 g
  D) none of the above
  Show Answer
  The correct answer is D .
• Question 777:

  To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

  Options:
  A) 298K
  B) 546K
  C) 819K
  D) 1092K
  Show Answer
  The correct answer is D .
• Question 778: Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction? Options:
  A) Increase in temperature will cause an increase in the equilibrium constant
  B) Increase in temperature will cause a decrease in the equilibrium constant
  C) Addition of a catalyst will cause an increase in the equilibrium constant
  D) Addition of a catalyst will cause a decrease in the equilibrium constant
  Show Answer
  The correct answer is B .
• Question 779: Which of the following equimolar solutions will have the highest pH? Options:
  A) CH₃COOHa
  B) NaOH
  C) HCl
  D) NH₄OH
  Show Answer
  The correct answer is B .
• Question 780:

  Which of the following types of bonding does not involve the formation of new substances?

  Options:
  A) Metallic
  B) Covalent
  C) Co-ordinate
  D) Electrovalent
  Show Answer
  The correct answer is A .