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 1241: Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series? Options:
  A) Copper
  B) Iron
  C) Lead
  D) Potassium
  E) Zinc
  Show Answer
  The correct answer is D .
• Question 1242:

  The choice of method for extracting a metal from its ores depends on the

  Options:
  A) strength of the core
  B) position of the metal in the electrochemical series
  C) source of the core
  D) position of the metal in the periodic table
  Show Answer
  The correct answer is B .
• Question 1243: mE + nF → pG + qH. In the equation above, the equilibrium constant is given by? Options:
  A) (E)^m(F)ⁿ/ (G)ⁿ(H)^q
  B) (E)(F) / (G)(H)
  C) (G)^p(H)^q / (E)^m(F)ⁿ
  D) (G)(H) / (E)(F)
  Show Answer
  The correct answer is C .
• Question 1244:

  Which of the following is a common laboratory indicator for bases?

  Options:
  A) Methyl orange
  B) Phenolphthalein
  C) Bromothymol blue
  D) Litmus
  Show Answer
  The correct answer is B .
• Question 1245: Which of the following represents an aromatic compound? Options:
  A) C₆H₅OH
  B) C₆H₁₂
  C) C₆H₉OH
  D) C₆H₈
  Show Answer
  The correct answer is A .
• Question 1246: Pure solvents are obtained by Options:
  A) distillation
  B) condensation
  C) extraction
  D) evaporation
  E) desolution
  Show Answer
  The correct answer is A .
• Question 1247: Which of the following is not an alkali? Options:
  A) Ca(OH)₂
  B) NH₃
  C) NaOH
  D) Al(OH)₃
  Show Answer
  The correct answer is B .
• Question 1248:

  The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm³ of vapour. The molecular formula of the liquid is

  [G.M.V =22.4 dm ³, C = 12, H = 1]

  Options:
  A) C ₃ H ₆
  B) C ₄H ₈
  C) C ₅C ₁₀
  D) C ₆H ₁₂
  Show Answer
  The correct answer is D .
• Question 1249:

  Benzene can be converted to its derivative toluene by the addition of a methyl group. The reaction is an example of

  Options:
  A) Nucleophilic substitution
  B) Elimination reaction
  C) Electrophilic substitution
  D) Addition reaction
  Show Answer
  The correct answer is C .
• Question 1250: The furring of kettles is caused by the presence in water of Options:
  A) calcium hydrogentrioxocarbonate (IV)
  B) calcium trioxocarbonate (IV)
  C) calcium tetraoxosulphate (VI)
  D) calcium hydroxide
  Show Answer
  The correct answer is B .