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 1101: Oil spillage in ponds and creeks can be cleaned up by? Options:
  A) burning off the oil layer
  B) spraying with detergent
  C) dispersal with compressed air
  D) spraying with hot water
  Show Answer
  The correct answer is B .
• Question 1102: 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 1103: Hydrogen sulphide gas can act as Options:
  A) an oxidizing agent
  B) a dehydrating agent
  C) a bleaching agent
  D) a precipitating agent
  Show Answer
  The correct answer is D .
• Question 1104: 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 1105: One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is? Options:
  A) an alkane
  B) an alkene
  C) an alkyne
  D) aromatic (C = 12, H = 1)
  Show Answer
  The correct answer is B .
• Question 1106:

  How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?

  (F = 96 500 C mol^-)

  Options:
  A) 0.5
  B) 1.0
  C) 1.5
  D) 3.0
  Show Answer
  The correct answer is C .
• Question 1107: In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base? Options:
  A) in the beaker
  B) in the conical flask
  C) in a burette
  D) in the standard flask
  E) in the measuring cylinder
  Show Answer
  The correct answer is B .
• Question 1108: The alkyl group can be represented by the general formula Options:
  A) C_nH_2n+1
  B) C_nH_2n
  C) C_nH_2n+2
  D) C_nH_2n-2
  Show Answer
  The correct answer is A .
• Question 1109:

  Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the

  Options:
  A) Acid
  B) Ester of alkanoic acid
  C) Alkali
  D) Alkanol
  Show Answer
  The correct answer is C .
• Question 1110: 35 cm³ of hydrogen was sparked with 12 cm³ of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen? Options:
  A) 11%
  B) 31%
  C) 35%
  D) 69%
  Show Answer
  The correct answer is B .