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 591:

  

  From the diagram above, an ideal can be represented by

  Options:
  A) M
  B) N
  C) K
  D) L
  Show Answer
  The correct answer is B .
• Question 592: Which of the following is used to study the arrangement of particles in crystal lattices? Options:
  A) Alpha-particles
  B) Beta-particles
  C) Gamma-rays
  D) X-rays
  Show Answer
  The correct answer is D .
• Question 593:

  The nucleus of an atom consists of?

  Options:
  A) Electrons and neutrons
  B) Electrons and protons
  C) Protons and neutrons
  D) None of the above
  Show Answer
  The correct answer is C .
• Question 594: An increase in entropy can best be illustrated by Options:
  A) mixing of gases
  B) freezing of water
  C) the condensation of vapour
  D) solidifying candle wax
  Show Answer
  The correct answer is A .
• Question 595:

  The alkanoic acid found in human sweat is

  Options:
  A) CH${}_3$-COOH
  B) CH${}_3$—CH${}_2$—COOH
  C) H-COOH
  D) CH${}_3$
  Show Answer
  The correct answer is B .
• Question 596: Which of the following equilibria is shifted to the right as a result of an increase in pressure? Options:
  A) H_2(g) + I_2(g) 2HI_(g)
  B) 2NO_2(g) N₂O_4(g)
  C) PCl_5(s) PCl_3(s) + Cl_2(g)
  D) 2O_3(g) 3O_2(g)
  Show Answer
  The correct answer is B .
• Question 597:

  The volume of 2.5 moles of oxygen at s.t.p is

  [Molar volume of a gas at s.t.p = 22.4 dm³]

  Options:
  A) 50.0 dm³
  B) 84.0 dm³
  C) 28.0 dm³
  D) 56.0 dm³
  Show Answer
  The correct answer is D .
• Question 598:

  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 599:

  

  Z in diagram above represents

  Options:
  A) heat of reaction
  B) activation energy
  C) free energy
  D) entropy of reaction
  Show Answer
  The correct answer is A .
• Question 600:

  H${}_2$ S${}_{(g)}$ + Cl${}_{2(g)}$ → 2HCl${}_{(g)}$ + S${}_{(g)}$ In the reaction above, the substance that is reduced is

  Options:
  A) H${}_2$S
  B) S
  C) HCl
  D) Cl${}_2$
  Show Answer
  The correct answer is D .