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 441: The shape of the hydrocarbon compound CH₄ is Options:
  A) square planar
  B) planar
  C) linear
  D) tetrahedral
  Show Answer
  The correct answer is D .
• Question 442:

  The constituent common to duralumin and alnico is

  Options:
  A) Co
  B) Mn
  C) Al
  D) Mg
  Show Answer
  The correct answer is C .
• Question 443: When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is? Options:
  A) methane
  B) hydrogen chloride
  C) hydrogen
  D) nitrogen
  E) carbondioxide
  Show Answer
  The correct answer is E .
• Question 444: The ideal gas laws and equations are true for all gases at Options:
  A) low pressures and lower temperatures
  B) low temperatures and high pressures
  C) high pressures and high temperatures
  D) low pressure and high temperatures
  Show Answer
  The correct answer is D .
• Question 445: The pollutant that contributes to the depletion of the ozone layer is Options:
  A) CFCs
  B) NO₂
  C) SO₂
  D) CO
  Show Answer
  The correct answer is A .
• Question 446: If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at Options:
  A) High temperature
  B) Any temperature
  C) Low temperature
  D) Minimum temperature
  Show Answer
  The correct answer is A .
• Question 447: A catalyst increase the rate of a chemical reaction by providing a path that Options:
  A) raise the activiation energy
  B) increase the temperature
  C) lowers the activation energy
  D) increase the concentration
  Show Answer
  The correct answer is C .
• Question 448: Which of the following substances is a mixture? Options:
  A) Sulphur powder
  B) Bronze
  C) Distilled water
  D) Ethanol
  Show Answer
  The correct answer is B .
• Question 449:

  Which of the following represents the kind of bonding present in ammonium chloride?

  Options:
  A) ionic only
  B) covalent only
  C) ionic and dative covalent
  D) dative covalent
  Show Answer
  The correct answer is C .
• Question 450: A noble gas with a high power of fog penetration used in aerodrome beacons is Options:
  A) krpton
  B) argon
  C) helium
  D) neon
  Show Answer
  The correct answer is D .