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 2071:

  

  Use the following option above to answer this question. Which of the following is the functional group of carboxylic acids?

  Options:
  A) A
  B) B
  C) C
  D) D
  E) E
  Show Answer
  The correct answer is D .
• Question 2072: Soap lather is an example of a colloid in which a? Options:
  A) liquid is dispersed in gas
  B) solid is dispersed in liquid
  C) gas is dispersed in liquid
  D) liquid is despersed in liquid
  Show Answer
  The correct answer is C .
• Question 2073: The alkaline hydrolysis of fats and oils produces soap and Options:
  A) propane 1, 1, 3 - triol
  B) propane - 1,2,3 - triol
  C) propane - 1,3,3 - triol
  D) propane - 1, 2, 2 - triol
  Show Answer
  The correct answer is B .
• Question 2074: Which of the following compound is a normal salt? Options:
  A) NaHS
  B) NaHSO₄
  C) NaHCO₃
  D) Na₂CO₃
  Show Answer
  The correct answer is D .
• Question 2075:

  A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

  Options:
  A) 75,000 particles
  B) 35,000 particles
  C) 25,000 particles
  D) 50,000 particles
  Show Answer
  The correct answer is C .
• Question 2076: In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ? Options:
  A) multiple proportion
  B) conservation of mass
  C) constant composition
  D) reciprocal proportion
  Show Answer
  The correct answer is C .
• Question 2077: Potassium vapour burns with a Options:
  A) blue flame
  B) brick-red flame
  C) violet flame
  D) golden-yellow flame
  Show Answer
  The correct answer is C .
• Question 2078: Alkanals can be differentiated from alkanones by reaction with? Options:
  A) 2,4-dinitrophenylhydrazine
  B) hydrogen cyanide
  C) sodium hydrogen sulphite
  D) Tollen's reagent
  Show Answer
  The correct answer is D .
• Question 2079:

  C₂H_4(g) + H_2(g) → C₂H_6(g) ΔH = -137kJ mol_-1

  The reaction represented above is

  Options:
  A) exothermic
  B) spontaneous
  C) endothermic
  D) in equilibrium
  Show Answer
  The correct answer is A .
• Question 2080: 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
  Show Answer
  The correct answer is A .