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 2221: Which of the following statements is TRUE of the complete hydrolysis of a glycerine by sodium hygroxide? Options:
  A) 3 moles ofNaOH are required for each mole of glyceride
  B) 3 moles of glycerol are produced
  C) Only one mole of soap is formed
  D) concentrated H₂SO₄ is essential for the completion of the reaction
  Show Answer
  The correct answer is A .
• Question 2222: How many unpaired electron are in the p-orbitals of a fluorine atom? Options:
  A) 3
  B) $0$
  C) 1
  D) 2
  Show Answer
  The correct answer is C .
• Question 2223: When sodium ethanoate is treated with a few drops of concentrated tetraoxosulphate(vi)acid. one of the products is Options:
  A) CH₃COOH
  B) CH₃COOCH₃
  C) CH₃COOC₂H₅
  D) C₂H₅COOCH₃
  Show Answer
  The correct answer is A .
• Question 2224:

  The metal used to recover copper from a solution of copper sulphateis?

  Options:
  A) Na
  B) Ag
  C) Hg
  D) Fe
  Show Answer
  The correct answer is D .
• Question 2225: The solution that will conduct the highest amount of electricity is Options:
  A) 0.5 mol dm^-3 of hydrochloric acid
  B) 2.0 mol dm^-3 of hydrochloric acid
  C) 0.5 mol dm^-3 ethanoic acid
  D) 2.0 mol dm^-3 ethanoic acid
  Show Answer
  The correct answer is A .
• Question 2226: Which of the following equilibria is unaffected by a pressure change? Options:
  A) 2NaCI(s) ↔ 2Na _(I) + CI_2(g)
  B) H _2(g) + I_2(g) ↔ 2HI_(g)
  C) 2O_3(g) ↔ 3O_2(g)
  D) 2NO_2(g) ↔ N₂O_4(g)
  Show Answer
  The correct answer is B .
• Question 2227: Which of the following is NOT a redox reaction? Options:
  A) 2HNO₂ + 2HI → 2H₂O + 2NO + I₂
  B) Zn + H₂SO₄ → ZnSO₄ + H₂
  C) Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂
  D) 4FeO + O₂ → 2Fe₂O₃
  E) 2Na + Cl₂ → 2NaCl
  Show Answer
  The correct answer is C .
• Question 2228:

  If a reaction is exothermic and there is a great disorder, it means that

  Options:
  A) The reaction is in a state of equilibrium.
  B) There will be a large increase in free energy.
  C) There will be a large decrease in free energy.
  D) The reaction is static.
  Show Answer
  The correct answer is C .
• Question 2229: A liquid that will dissolve fat is Options:
  A) hydrochloric acid
  B) calcium hydrochloride
  C) kerosene
  D) water
  Show Answer
  The correct answer is C .
• Question 2230:

  Zn + 2HCL ZnCl${}_2$ + H${}_2$

  What happens to zinc in the above reaction?

  Options:
  A) oxidized
  B) a reactant
  C) reduced
  D) a metal
  Show Answer
  The correct answer is A .