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 1601:

  What mass of Cu would be produced by the cathodic reduction of Cu${}^{2+}$  when 1.60A of current passes through a solution of CuSO${}_4$ for 1 hour. (F=96500Cmol${}^{-1}$ , Cu=64)

  Options:
  A) 7.64g
  B) 3.82g
  C) 1.91g
  D) 0.96g
  Show Answer
  The correct answer is C .
• Question 1602: Which of the following statements is correct about the periodic table? Options:
  A) elements in the same period have the same number of valence electrons
  B) the valence electrons of the elements in the same period increase progressively 'across the period
  C) elements in the same group have the same number of electron shell
  D) the non-metallic properties of the elements tend to decrease across each period
  Show Answer
  The correct answer is B .
• Question 1603:

  A gaseous metallic chloride MCl_x consists of 20.22% of M by mass. The formula of the chloride is

  [M = 27, Cl = 35.5]

  Options:
  A) MCl
  B) MCl₂
  C) MCl₃
  D) M₂Cl₆
  Show Answer
  The correct answer is C .
• Question 1604:

  

  The compound above exhibits

  Options:
  A) Geometric isomerism
  B) Positional isomerism
  C) Structural isomerism
  D) Optical isomerism
  Show Answer
  The correct answer is D .
• Question 1605:

  What is the name of the process by which ammonia is produced on an industrial scale?

  Options:
  A) Nitrogenation
  B) Ammoniation
  C) Nitrification
  D) Haber process
  Show Answer
  The correct answer is D .
• Question 1606: Which of the following gives a precipitation when treated with NaOH Solution? Options:
  A) AlCl₃
  B) NH₄Cl
  C) Na₂CO₃
  D) CH₃COONa
  Show Answer
  The correct answer is A .
• Question 1607:

  The IUPAC name for CH${}_3$CH${}_2$COOCH${}_2$CH${}_3$ is

  Options:
  A) methylpropanoate
  B) ethylethanoate
  C) ethylpropanoate
  D) methylethanoate
  Show Answer
  The correct answer is C .
• Question 1608: The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are Options:
  A) Hydrogen and oxygen gases
  B) Water and hydrogen gas
  C) Water and sodium metal
  D) Sodium metal and oxygen gas
  Show Answer
  The correct answer is A .
• Question 1609: 25cm³ of a 0.2 mol dm³ solution of Na₂CO₃ requires 20 cm³ of a solution of HCl for neutralization. The concentration of the HCl solution is Options:
  A) 0.5 mol dm³
  B) 0.6 mol dm³
  C) 0.2 mol dm³
  D) 0.4 mol dm³
  Show Answer
  The correct answer is A .
• Question 1610: Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has Options:
  A) more molecules
  B) more atoms
  C) larger surface area
  D) relatively large mass
  Show Answer
  The correct answer is C .