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 411: Catalytic hydrogenation of benzene produces? Options:
  A) an aromatic hydrocarbon
  B) margarine
  C) cyclohexane
  D) D.D.T
  Show Answer
  The correct answer is C .
• Question 412:

  The inherited traits of an organism are controlled by?

  Options:
  A) RNA molecules
  B) Nucleotides
  C) DNA molecules
  D) Enzymes
  Show Answer
  The correct answer is C .
• Question 413:

  What happens when alkanoic acids react with alcohols in the presence of an acid catalyst?

  Options:
  A) Saponification
  B) Esterification
  C) Polymerization
  D) Hydrolysis
  Show Answer
  The correct answer is B .
• Question 414: Bronze is an alloy of Options:
  A) copper, zinc and nickel
  B) aluminium and copper
  C) copper and zinc
  D) tin and zinc
  E) tin and copper
  Show Answer
  The correct answer is E .
• Question 415: Which of the following is NOT an alkali? Options:
  A) NH₃
  B) Mg(OH)₂
  C) Ca(OH)₂
  D) NaOH
  Show Answer
  The correct answer is A .
• Question 416:

  The general formula of alkanones is

  Options:
  A) RCHO
  B) R${}_2$CO
  C) RCOOH
  D) RCOOR
  Show Answer
  The correct answer is B .
• Question 417: Which of the following equations show that a reaction is in equilibrium?
  Options:
  A) ΔG < O
  B) ΔG = ΔH – TΔS
  C) ΔG > O
  D) ΔG = O
  Show Answer
  The correct answer is D .
• Question 418: When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes Options:
  A) negatively charged
  B) positvely charged
  C) neutral
  D) bipolar
  Show Answer
  The correct answer is A .
• Question 419:

  8g CH₄ occupies 11.2 dm³ at s.t.p. What volume would 22 g of CH₃CH₃ occupy under the same condition?

  (C = 12, H = 1)

  Options:
  A) 3.7 dm³
  B) 11.2 dm³
  C) 22.4 dm³
  D) 33.6 dm³
  Show Answer
  The correct answer is B .
• Question 420: A particle that contains 9 protons, 10 neutrons and 10 electrons is a Options:
  A) negative ion
  B) positive ion
  C) neutral atom of non-metal
  D) neutral atom of a metal
  Show Answer
  The correct answer is A .