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 41: Nigerian crude oil is described as light crude because of its Options:
  A) low sulphur content
  B) high natural gas content
  C) high octane number
  D) low aliphatic-hydrocarbon content
  Show Answer
  The correct answer is A .
• Question 42: Water for town supply is chlorinated to make it free from? Options:
  A) bad odour
  B) bacteria
  C) temporary hardness
  D) permanent hardness
  Show Answer
  The correct answer is B .
• Question 43: Synthesis gas is a mixture of Options:
  A) CH₄ and H₂O
  B) CH₄ and H₂
  C) CO₂ and H₂
  D) CO and H₂
  Show Answer
  The correct answer is D .
• Question 44: 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 45: The arrangement of particles in crystal lattices can be studied using Options:
  A) X-rays
  B) $\beta$-rays
  C) $\alpha$-rays
  D) $\gamma$-rays
  Show Answer
  The correct answer is A .
• Question 46: Which of the following statements is true about 2-methylpropane and butane Options:
  A) They have different number of carbon atoms
  B) They are members of same homologous series
  C) They have the same boiling points
  D) They have the same chemical properties
  Show Answer
  The correct answer is D .
• Question 47: Which of the following gases contains the least number of atoms at s.t.p? Options:
  A) 1 mole of butane
  B) 3 mole of ozone
  C) 4 mole of chlorine
  D) 7 mole of argon
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  The correct answer is A .
• Question 48: The chemical reaction which takes place at the anode (positive electrode) in electrolysis is? Options:
  A) oxidation
  B) hydrolysis
  C) dissociation
  D) reduction
  E) disproportionation
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  The correct answer is A .
• Question 49: The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the Options:
  A) forces of attraction and repulsion are in equilibrium
  B) gaseous molecules can occupy any available space
  C) gaseous molecules will continue their motion indefinitely
  D) gases can be compressed
  Show Answer
  The correct answer is C .
• Question 50:

  A mixture of iron and sulphur can be separated by dissolving the mixture in?

  Options:
  A) steam
  B) dilute hydrochloric acid
  C) dilute sodium hydroxide
  D) benzene
  Show Answer
  The correct answer is B .