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 1151: P1V1 = P2V2 supports ? Options:
  A) Charles’s law
  B) Boyles’s law
  C) Graham’s law
  D) Avogadro’s law
  Show Answer
  The correct answer is B .
• Question 1152: A trihydric alkanol is Options:
  A) Glycerol
  B) Phenol
  C) Glycol
  D) Ethanol
  Show Answer
  The correct answer is A .
• Question 1153:

  Which of the following reactions is an oxidation process?

  Options:
  A) 2H${}^{+}$ + 2e${}^{-}$ $\to$ H${}_2$
  B) 2O${}^{2-}$ + 4e${}^{-}$ $\to$ O${}_2$
  C) OCl${}^{-}$ + H${}_2$O + 2e${}^{-}$ $\to$ 2OH${}^{-}$ + Cl${}^{-}$
  D) Cl + e${}^{-}$ $\to$ Cl${}^{-}$
  Show Answer
  The correct answer is B .
• Question 1154: Pure solvents are obtained by Options:
  A) distillation
  B) condensation
  C) extraction
  D) evaporation
  E) desolution
  Show Answer
  The correct answer is A .
• Question 1155:

  According to the kinetic theory of gases, the pressure exerted by a gas is due to

  Options:
  A) The vibrations of gas particles.
  B) The weight of the gas particles
  C) The attractive forces between gas particles
  D) The collisions of gas particles with the container walls
  Show Answer
  The correct answer is D .
• Question 1156:

  

  The gas that is removed by the water in the flask is

  Options:
  A) O₂
  B) SO₂
  C) HCI.
  D) H₂
  Show Answer
  The correct answer is C .
• Question 1157: Which of these statements is TRUE about carbon (IV) oxide? Options:
  A) it supports combustion
  B) It is strongly acidic in water
  C) It is very soluble in water
  D) It supports the buring of magnesium to produce magnesium oxide
  Show Answer
  The correct answer is C .
• Question 1158:

  

  In the shown experiment (Fig. 1) the litmus paper will initially

  Options:
  A) be bleached
  B) turn green
  C) turn red
  D) turn blue
  Show Answer
  The correct answer is D .
• Question 1159: How many unpaired electron are in the p-orbitals of a fluorine atom? Options:
  A) 3
  B) $0$
  C) 1
  D) 2
  Show Answer
  The correct answer is C .
• Question 1160:

  

  In the diagram above the gas Y could be

  Options:
  A) hydrogen chloride
  B) oxygen
  C) carbon (IV) oxide
  D) chlorine
  Show Answer
  The correct answer is A .