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 1081: The most suitable metal that can be used as lightning conductor is Options:
  A) silver
  B) copper
  C) iron
  D) aluminium
  Show Answer
  The correct answer is B .
• Question 1082: The most important use of hydrogen is in the Options:
  A) manufacture of ammonia
  B) manufacture of methyl alcohol
  C) manufacture of ethyl alcohol
  D) hydrogenation of oils
  Show Answer
  The correct answer is A .
• Question 1083:

  

  Which of the curves above represents the behaviour of 1 mole of an ideal gas?

  Options:
  A) l
  B) ll
  C) lll
  D) lV
  Show Answer
  The correct answer is C .
• Question 1084: Which of the following reactions takes place in the cathode compartment during the electrolysis of copper (II) chloride solution? Options:
  A) Cu²⁺ + 2e^- → Cu(s)
  B) 2Cl^- -2e → Cl₂
  C) Cu_(s) -2e → Cu²⁺_(aq)
  D) Cu²⁺_(aq) + 2Cl^-_(aq) → CuCl_2(aq)
  Show Answer
  The correct answer is A .
• Question 1085: Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, Options:
  A) P will form an electrovalent bond with R
  B) Q will form a covalent bond with S
  C) R will form an electrovalent bond with S
  D) Q will form an electrovalent bond with S
  E) Q will form a covalent bond with R
  Show Answer
  The correct answer is D .
• Question 1086: A major factor coonsidered in selecting a suitable method for preparing a simple salt is its Options:
  A) crystalline form
  B) melting point
  C) reactivity with dilute acids
  D) solubility in water
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  The correct answer is D .
• Question 1087: The correct order of increasing boiling points of the following compounds C₃H₇OH, C₇H₁₆ and C₄H₁₀ is Options:
  A) C₃H₇OH → C₄H₁₀ → C₇H₁₀
  B) C₄H₁₀ → C₇H₁₆ → C₃H₇OH
  C) C₇H₁₆ → C₃H₇OH → C₄H₁₀
  D) C₄H₁₀ → C₃H₇OH → C₇H₁₆
  Show Answer
  The correct answer is D .
• Question 1088: Which of the following compounds will form a solution if exposed to air? Options:
  A) Na₂CO₃.10H₂O
  B) NaNO₃
  C) CuSO₄
  D) CaCl₂
  E) Na₂SO₄.10H₂O
  Show Answer
  The correct answer is D .
• Question 1089:

  

  The oxidation of

  Options:
  A) 2-butanone
  B) 2-butanal
  C) butane
  D) butanoic acid
  E) 3-butanal
  Show Answer
  The correct answer is A .
• Question 1090: What is the percentage of sulphur in sulphur (IV) oxide? Options:
  A) 66%
  B) 25%
  C) 40%
  D) 50%
  Show Answer
  The correct answer is D .