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 161:

  Which of the following could not be alkane?

  Options:
  A) C${}_4$H${}_{10}$
  B) C${}_5$H${}_{12}$
  C) C${}_7$H${}_{14}$
  D) C${}_8$H${}_{18}$
  Show Answer
  The correct answer is C .
• Question 162:

  CuO_(s) + H_2(g) ↔ Cu_(s) + H₂O_(l)

  What is the effect of increasing the pressure on the equilibrium reaction above?

  Options:
  A) The equilibrium is shifted to the left
  B) The equilibrium is shifted to the right
  C) There is no effect
  D) More H_2(g) is produced
  Show Answer
  The correct answer is C .
• Question 163:

  When chlorine water is exposed to bright sunlight, the following products are formed

  Options:
  A) HCl${}_{(aq)}$ and Cl${}_2$
  B) HOCl${}_{(aq)}$ and Cl${}_2$
  C) HCl${}_{(aq)}$ and O${}_2$
  D) HOCl${}_{(aq)}$ and O${}_2$
  Show Answer
  The correct answer is C .
• Question 164: Phenolphthalein in acidic solution is Options:
  A) red
  B) orange
  C) colourless
  D) yellow
  Show Answer
  The correct answer is C .
• Question 165:

  What is the solubility product constant (Ksp) used for?

  Options:
  A) To measure the total mass of a solute that can dissolve in a solvent
  B) To determine the concentration of a solute in a saturated solution
  C) To calculate the solubility of a solute in a given solvent
  D) To compare the solubilities of different solutes in the same solvent
  Show Answer
  The correct answer is B .
• Question 166:

  The inherited traits of an organism are controlled by?

  Options:
  A) RNA molecules
  B) Nucleotides
  C) DNA molecules
  D) Enzymes
  Show Answer
  The correct answer is C .
• Question 167:

  In troposphere, the two types of pollutants are?

  Options:
  A) Gaseous and particulate pollutants
  B) Carbon and metallic pollutants
  C) Natural and man-made pollutants
  D) Sulphuric and nitrogenous pollutants
  Show Answer
  The correct answer is A .
• Question 168:

  A solution X, on mixing with AgNO${}_3$ solution gives a white precipitate soluble in aqueous NH${}_3$, a solution Y, when also added to X, also gives a white precipitate which is soluble when heated solutions X and Y respectively contain

  Options:
  A) Al${}^{3+}$, Cl${}^{-}$
  B) Hg${}^{+}$, SO${}_4^{2-}$
  C) Pb${}^{2+}$, Cl${}^{-}$
  D) Ag${}^{+}$, SO${}_4^{2-}$
  Show Answer
  The correct answer is C .
• Question 169:

  N₂O_4(g) ↔ 2NO_2(g)

  In the endothermic reaction above, more product formation will be favoured by

  Options:
  A) a constant volume
  B) an increase in pressure
  C) a decrease in pressure
  D) a decrease in volume
  Show Answer
  The correct answer is C .
• Question 170: The type of isomerism shown by cis- and trans- isomers is Options:
  A) optical isomerism
  B) positional isomerism
  C) functional isomerism
  D) geometrical isomerism
  Show Answer
  The correct answer is D .