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 111: If 24.83 cm³ of 0.15 M NaOH is titrated to its end point with 39.45 cm³ of HCl, what is the molarity of the HCl? Options:
  A) 0.094 M
  B) 0.150 M
  C) 0.940 M
  D) 1.500 M
  Show Answer
  The correct answer is A .
• Question 112: Which of the following statements is true about 2-methylpropane and butane Options:
  A) They are members of the same homologous series
  B) They have the same boiling point
  C) They have different number of carbon atoms
  D) They have the same chemical properties
  Show Answer
  The correct answer is A .
• Question 113:

  The contact process is used for the industrial production of

  Options:
  A) sulfuric acid (H2SO4)
  B) Hydrochloric acid (HCl)
  C) Sodium hydroxide (NaOH)
  D) Calcium oxide (CaO)
  Show Answer
  The correct answer is A .
• Question 114:

  The size (diameter) of five elements are in the order R < T < W < X < Y, Y being the largest. If each atom has an electron situated on its circumference, and neglecting other factors, which of the atoms will lose its electron most reluctantly?

  Options:
  A) R
  B) T
  C) W
  D) X
  E) Y
  Show Answer
  The correct answer is A .
• Question 115: The shapes of CO${}_2$, H${}_2$O and CH${}_4$ respectively are Options:
  A) bent, linear and tetrahedral
  B) bent, tetrahedral and linear
  C) linear, bent and tetrahedral
  D) tetrahedral, linear and bent
  Show Answer
  The correct answer is C .
• Question 116:

  When heat is absorbed during a chemical reaction, the reaction is said to be

  Options:
  A) thermodynamic
  B) exothermic
  C) isothermal
  D) endothermic
  Show Answer
  The correct answer is D .
• Question 117: Water has a rather high boiling point despite its low molecular mass because of the presence of? Options:
  A) hydrogen bonding
  B) covalent bonding
  C) ionic bonding
  D) metallic bonding
  Show Answer
  The correct answer is A .
• Question 118:

  In electrovalency, the oxidation number of the participating metal is always

  Options:
  A) decreasing
  B) increasing
  C) constant
  D) neutral
  Show Answer
  The correct answer is C .
• Question 119: Chlorine consisting of two isotopes of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotopes of mass number 37 Options:
  A) 20
  B) 25
  C) 60
  D) 75
  Show Answer
  The correct answer is B .
• Question 120: Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has Options:
  A) more molecules
  B) more atoms
  C) larger surface area
  D) relatively large mass
  Show Answer
  The correct answer is C .