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 1551: The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and? Options:
  A) nitrogen (ll) oxide
  B) nitrogen (l) oxide
  C) nitrogen (lV) oxide
  D) nitrogen
  Show Answer
  The correct answer is C .
• Question 1552:

  Aluminum hydroxide is used in the dyeing industry as a?

  Options:
  A) Dye
  B) Dispersant
  C) Salt
  D) Mordant
  Show Answer
  The correct answer is D .
• Question 1553: The alkaline hydrolysis of fats and oils produces soap and Options:
  A) propane 1, 1, 3 - triol
  B) propane - 1,2,3 - triol
  C) propane - 1,3,3 - triol
  D) propane - 1, 2, 2 - triol
  Show Answer
  The correct answer is B .
• Question 1554: The knowledge of half-life can be used to Options:
  A) create an element
  B) detect an element
  C) spilt an element
  D) irradiate an element
  Show Answer
  The correct answer is B .
• Question 1555: The reaction that takes place in Daniell cell is Options:
  A) direct combination
  B) redox
  C) double decomposition
  D) neutralization
  Show Answer
  The correct answer is B .
• Question 1556: In the reaction 1O^-₃ + 5l^- + 6H⁺ → 31₂ + 3H₂O, the oxidizing agent is? Options:
  A) H⁺
  B) l^-
  C) 1O^-
  D) l₂
  Show Answer
  The correct answer is C .
• Question 1557: Soap lather is an example of a colloid in which a? Options:
  A) liquid is dispersed in gas
  B) solid is dispersed in liquid
  C) gas is dispersed in liquid
  D) liquid is despersed in liquid
  Show Answer
  The correct answer is C .
• Question 1558: Which of the following statements is correct about the periodic table? Options:
  A) Elements in the same group have the same number of electron shells
  B) The non-metallic properties of the elements tend to decrease across each period
  C) Elements in the same period have the same number of valence electrons
  D) The valence electrons of the elements increase progressively across the period
  Show Answer
  The correct answer is D .
• Question 1559: Arrange HCI, CH₃COOH, C₆H₅CH₃ in order of increasing conductivity. Options:
  A) HCI, CH₃COOH, C₆H₅CH₃
  B) C₆H₅CH₃, HCI, CH₃COOH
  C) C₆H₅CH₃, CH₃COOH, HCI
  D) CH₃COOH, C₆H₅CH₃, HCI
  Show Answer
  The correct answer is C .
• Question 1560: In the reaction M + N P;∆H = + QKJ. Which of the following would increase the concentration of the product? Options:
  A) Decreaseing the concentration of N
  B) Increasing the concentration of P
  C) Adding a suitable catalyst
  D) Decreasing the temperature
  E) Increasing the temperature
  Show Answer
  The correct answer is E .