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 191: The arrangement of particles in crystal lattices can be studied using Options:
  A) X-rays
  B) $\beta$-rays
  C) $\alpha$-rays
  D) $\gamma$-rays
  Show Answer
  The correct answer is A .
• Question 192: Pure solvents are obtained by Options:
  A) distillation
  B) condensation
  C) extraction
  D) evaporation
  E) desolution
  Show Answer
  The correct answer is A .
• Question 193: According to Charle's law, the volume of a gas becomes zero at Options:
  A) −100°c
  B) −273°c
  C) −373°c
  D) 0°c
  Show Answer
  The correct answer is B .
• Question 194:

  A secondary alkanol can be oxidized to give an

  Options:
  A) alkanone
  B) alkyne
  C) alkanoic acid
  D) alkanal
  Show Answer
  The correct answer is A .
• Question 195: Which of the following gases can be collected by the upward displacement of air? Options:
  A) NO
  B) H ₂
  C) NH₃
  D) Cl ₂
  Show Answer
  The correct answer is D .
• Question 196: How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour? Options:
  A) 3.90 x 10² coulombs
  B) 5.50 x 10³ coulombs
  C) 6.54 x 10³ coulombs
  D) 2.34 x 10⁴ coulombs
  Show Answer
  The correct answer is D .
• Question 197: The IUPAC nomenclature of compound CH₃CH₂COOCH₂CH₃ is Options:
  A) propyl ethanoate
  B) ethyl butanoate
  C) ethyl propanoate
  D) methyl butanoate
  Show Answer
  The correct answer is C .
• Question 198: What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm³ of 0.05 M acid? Options:
  A) 0.05 dm³
  B) 0.10 dm³
  C) 0.55 dm³
  D) 11.0 dm³
  Show Answer
  The correct answer is A .
• Question 199: 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 200:

  Which two gases can be used for the demonstration of the fountain experiment?

  Options:
  A) SO${}_3$ and NH${}_3$
  B) SO${}_2$ and NH${}_3$
  C) HCl and NH${}_3$
  D) SO${}_2$ and HCl
  Show Answer
  The correct answer is C .