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 1431:

  Which of the following are mixtures?

  i. Petroleum
  ii. Rubber latex
  iii. Vulcanizer's solution
  iv. Carbon (II) sulphide

  Options:
  A) i, ii and iii
  B) i, ii and iv
  C) i and ii only
  D) i and iv
  Show Answer
  The correct answer is A .
• Question 1432:

  

  The two functional groups in the above compound are

  Options:
  A) alcohol and amine
  B) acid and amine
  C) aldehyde and acid
  D) ketone and amine
  Show Answer
  The correct answer is B .
• Question 1433: CHCl₃ + Cl₂ → HCl + CCl₄. The reaction above is an example of? Options:
  A) an addition reaction
  B) a substitution reaction
  C) a chlorination reaction
  D) a condensation reaction
  Show Answer
  The correct answer is B .
• Question 1434: Unsaturated organic compounds are identified by decolourization of Options:
  A) silver bromine and potassium tetraoxomanganate (VII) solutions
  B) bromine water and acidified potassium tetraoxomanganate (VII) solution
  C) silver bromide solution and bromine water
  D) bromine water and alkaline potassium tetraoxomanganate (VII) solution
  Show Answer
  The correct answer is B .
• Question 1435: The knowledge of half-life can be used to Options:
  A) create an element
  B) detect an element
  C) split an element
  D) irradiate an element
  Show Answer
  The correct answer is A .
• Question 1436: If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change. Options:
  A) +2081 Jmol^-1
  B) -2081 Jmol^-1
  C) -649 Jmol^-1
  D) +649 Jmol^-1
  Show Answer
  The correct answer is A .
• Question 1437: Which of the following has an isomer? Options:
  A) C₆H₆
  B) C₂H₆
  C) C₄H₁₀
  D) C₂H₄
  Show Answer
  The correct answer is C .
• Question 1438:

  

  The compound above is the product of the oxidation of

  Options:
  A) 2-methlbutan-2-ol
  B) 2-methylbutan -1- ol
  C) 2, 3-dimethylprop 1-ol
  D) Pentan -2- ol
  Show Answer
  The correct answer is B .
• Question 1439: Diffusion is slowest in solid particles than in particles of liquid and gases because Options:
  A) solid particles have more kinetic energy than the particles of liquid and gases
  B) solid particles have less kinetic energy than the particles of liqiud and gases
  C) solid particles have less restriction in their movement than liquid and gas particles
  D) the particles in solids are far apart and the cohesive forces between them are negligible
  Show Answer
  The correct answer is B .
• Question 1440:

  

  The appropriate test paper to use in the above experiment is moist

  Options:
  A) litmus psper
  B) potassium heptaoxodichromate (IV) paper
  C) lead (ll) trioxonitrate (V) paper
  D) universal indicator paper
  Show Answer
  The correct answer is C .