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 261: Ethanol is soluble in water due to the presence of a Options:
  A) Carbonyl group
  B) Hydroxyl groupd
  C) Phenyl group
  D) Methyl group
  Show Answer
  The correct answer is B .
• Question 262: CaO_s + H₂O_(l) → Ca(OH)_2(s) ΔH -65 kj. The process represented by the above equation is known as? Options:
  A) dissolution
  B) slaking
  C) liming
  D) mortaring
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  The correct answer is B .
• Question 263:

  

  2-methylbut-2-ene has the structure

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is D .
• Question 264:

  C_(s) + 2S_(g) → CS_2(g)

  ΔH = +89 kJ mol^-1

  The chemical equation above implies that

  Options:
  A) each of carbon and sulphur has 89 kJ of energy
  B) both carbon and sulphur contribute 89 kJ of energy
  C) 89 kJ of energy is released
  D) 89 kJ of energy is absorbed
  Show Answer
  The correct answer is D .
• Question 265: In the discovery of protein, the instrument used is Options:
  A) cathode ray tube
  B) glass tube and discharge tube
  C) discharge tube with terminal cathode
  D) discharge tube with central cathode
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  The correct answer is D .
• Question 266:

  Which of the following is a set of neutral oxides?

  Options:
  A) N${}_2$O, H${}_2$O, CO
  B) N${}_2$O, SO${}_2$, CO
  C) N${}_2$O, Na${}_2$O, ZnO
  D) N${}_2$O, SO${}_3$, NO
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  The correct answer is A .
• Question 267:

  The only metal that is anti-bacterial is?

  Options:
  A) Iron
  B) Sodium
  C) Alluminium
  D) Copper
  Show Answer
  The correct answer is D .
• Question 268: Which of the following is a physical change? Options:
  A) Freezing ice cream
  B) dissolving calcium in water
  C) burning kerosene
  D) Exposing white phosphorus to air
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  The correct answer is A .
• Question 269: What is the decrease in volume of air when pyrogallol is shaken with 30.00cm³ of air ? Options:
  A) 15.00cm³
  B) 6.30cm³
  C) 0.63cm³
  D) 0.06cm³
  Show Answer
  The correct answer is B .
• Question 270: The energy value of petrol can be determined by Options:
  A) Bomb calorimeter
  B) Catalytic cracker
  C) Fractionating column
  D) Thermometer
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  The correct answer is C .