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 2221:

  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 2222:

  The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

  Options:
  A) saponification
  B) dehydration
  C) esterification
  D) hydrolysis
  Show Answer
  The correct answer is C .
• Question 2223: Which of the following conduct electricity? Options:
  A) sulfur
  B) graphite
  C) diamond
  D) red phosphorus
  E) yellow phosphorus
  Show Answer
  The correct answer is B .
• Question 2224:

  ₁²D + ₁³T → ₂⁴He + ₀¹n + energy

  The reaction above illustrates

  Options:
  A) alpha decay
  B) artificial transmutation
  C) nuclear fussion
  D) nuclear fission
  Show Answer
  The correct answer is C .
• Question 2225: The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is Options:
  A) A suspension
  B) Saturated
  C) Unsaturated
  D) Supersaturated
  Show Answer
  The correct answer is C .
• Question 2226:

  

  The above reaction is an example of

  Options:
  A) a displacement reaction
  B) a neutralization reaction
  C) an elimination reaction
  D) saponification
  Show Answer
  The correct answer is B .
• Question 2227: The conversion of open chain alkanes into cycloalkanes and aromatic compounds is called Options:
  A) cracking
  B) reforming
  C) isomerization
  D) polymerization
  Show Answer
  The correct answer is B .
• Question 2228: Hydration of ions in solution is associated with Options:
  A) absorption of heat
  B) reduction of heat
  C) conduction of heat
  D) liberation of heat
  Show Answer
  The correct answer is D .
• Question 2229:

  A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

  Options:
  A) collisions are perfectly elastic
  B) forces of repulsion exist
  C) forces of repulsion and attraction are in equilibrium
  D) collisions are inelastic
  Show Answer
  The correct answer is B .
• Question 2230: Smog usually occurs over cities which Options:
  A) burn a lot of fossil fuels
  B) have very few plants
  C) are surrounded by water
  D) are overpopulated
  Show Answer
  The correct answer is A .