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 2141: Vulcanization of rubber is a process by which Options:
  A) isoprene units are joined to produce rubber
  B) rubber latex is coagulated
  C) sulphur is chemically combined in the rubber
  D) water is removed from the rubber
  Show Answer
  The correct answer is C .
• Question 2142:

  Which of the following types of alkanols undergo oxidation to produce alkanoic acids.I. Primary alkanols

  II. Secondary alkanols

  III. Tertiary alkanols

  Options:
  A) I, II and III
  B) I and II only
  C) III only
  D) I only
  Show Answer
  The correct answer is D .
• Question 2143:

  

  The compound above is an

  Options:
  A) ether
  B) ester
  C) alkanal
  D) alkanol
  Show Answer
  The correct answer is B .
• Question 2144: the elements that belong to the third period of the periodic table are Options:
  A) Li, Be, Al and P
  B) Na, P, O and Cl
  C) B, C, N and O
  D) Nz, Mg, S and Ar
  Show Answer
  The correct answer is D .
• Question 2145: The fundamental difference between the three states of matter is the Options:
  A) shape of their particles
  B) number of particles in each state
  C) shape of the container they occupy
  D) degree movement of their particles
  Show Answer
  The correct answer is D .
• Question 2146:

  What is the principal ore of iron, from which iron is extracted?

  Options:
  A) Calcite
  B) Bauxite
  C) Magnetite
  D) Hematite
  Show Answer
  The correct answer is D .
• Question 2147: An element, E, has the electronic configuration 1s²2s²2p⁶3s²p³. The reaction of E with a halogen X can give? Options:
  A) EX₃ and EX₅
  B) EX₃ only
  C) EX₅ only
  D) EX₂ and EX₃
  Show Answer
  The correct answer is A .
• Question 2148:

  Which organic compound is responsible for the characteristic aroma of fruits?

  Options:
  A) Alkane
  B) Alkyne
  C) Ester
  D) Amine
  Show Answer
  The correct answer is C .
• Question 2149: The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be? Options:
  A) ionic
  B) covalent
  C) dative covalent
  D) metallic
  E) none of the above
  Show Answer
  The correct answer is B .
• Question 2150: Bronze is an alloy of? Options:
  A) silver and copper
  B) silver and gold
  C) copper and nickle
  D) copper and zinc
  E) copper and tin
  Show Answer
  The correct answer is E .