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 1081: 20 cm³ of 1.0 molar NH₄OH solution when neutralized with 20.05cm³ of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH₄OH? Options:
  A) -51.O KJ mol^-
  B) +57.3 KJ mol^-
  C) +57.O KJ mol^-
  D) +51.0 KJ mol^-
  Show Answer
  The correct answer is A .
• Question 1082: Ethyne is passed through a hot tube containing organo-nickel catalyst to produce Options:
  A) isoprene
  B) polythene
  C) ethanol
  D) benzene
  Show Answer
  The correct answer is D .
• Question 1083:

  8g CH₄ occupies 11.2 dm³ at s.t.p. What volume would 22 g of CH₃CH₃ occupy under the same condition?

  (C = 12, H = 1)

  Options:
  A) 3.7 dm³
  B) 11.2 dm³
  C) 22.4 dm³
  D) 33.6 dm³
  Show Answer
  The correct answer is B .
• Question 1084: Which of the following are the products of the reaction between CH₃COOH and CI₂ in sunlight? Options:
  A) CICH₂COOH + HCI
  B) CH₃COCI + HOCI
  C) CH₃COOCI + HCI
  D) CH₃COCI + HO₂
  Show Answer
  The correct answer is A .
• Question 1085: There are basic particles from which matter called be made except Options:
  A) Salt
  B) Atom
  C) Ion
  D) Molecule
  Show Answer
  The correct answer is A .
• Question 1086: An element Z, contained 90% of ¹⁶₈Z and 10% of Z¹⁸₁₈ its relative atomic mass is? Options:
  A) 16.0
  B) 16.2
  C) 17.0
  D) 17.8
  Show Answer
  The correct answer is B .
• Question 1087: 1.0 dm³ of distilled water was used to wash 2.0g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 * 10^-10mol²dm^-6, what quantity of silver was lost in the process? Options:
  A) 2.029 * 10^-3mol dm^-3
  B) 1.414 * 10^-3mol dm^-3
  C) 2.029 * 10^-5mol dm^-3
  D) 1.414 * 10^-5mol dm^-3
  Show Answer
  The correct answer is D .
• Question 1088: The ion that can be used as an oxidizing agent is Options:
  A) Au³⁺
  B) Fe³⁺
  C) F^-
  D) Ca²⁺
  Show Answer
  The correct answer is C .
• Question 1089: In which of the following is the oxidation state of oxygen different from its value in water? Options:
  A) OH^-
  B) H₃O⁺
  C) O^-
  D) H₂O₂
  E) SO₂
  Show Answer
  The correct answer is D .
• Question 1090: In which of the following are water molecules in the most disorderly arrangement? Options:
  A) Ice at -10°C
  B) Ice at 0°C
  C) Water at 100°C
  D) Steam at 100°C
  Show Answer
  The correct answer is D .