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 1201:

  

  Use the diagram above to answer this question.

  Which of the following structural formula is NOT isomeric with the others?

  Options:
  A) A
  B) B
  C) C
  D) D
  E) E
  Show Answer
  The correct answer is D .
• Question 1202:

  Zn _(s) + CuSO ₄(aq) → ZnSO ₄(aq) + Cu _(s)

  In the reaction above, the oxidation number of the reducing agent changes from

  Options:
  A) 0 to + 4
  B) 0 to + 2
  C) + 1 to + 2
  D) + 1 to + 3
  Show Answer
  The correct answer is B .
• Question 1203: Which experiment led to the measurement of the charge on an electron? Options:
  A) Mass spectrometric experiment
  B) Oil-drop experiment
  C) Scattering α - particles
  D) Discharge-tube experiment
  Show Answer
  The correct answer is B .
• Question 1204: Alkanes Options:
  A) are all gases
  B) have the general formula C_nH_2n + ₂O
  C) contain only carbon and hydrogen
  D) are usually soluble in water
  E) are usually active compounds
  Show Answer
  The correct answer is C .
• Question 1205: At 25^oC and 1atm, a gas occupies a volume of 1.50dm³. What volume will it occupy at 100^oC and 1atm? Options:
  A) 1.88 dm³
  B) 6.00 dm³
  C) 18.80 dm³
  D) 18.80 dm³
  E) 60.00dm³
  Show Answer
  The correct answer is A .
• Question 1206: CH₃COOC₂H₅(1) + H₂O₍₁₎ ⇌ CH ₃COOH _(aq) + C ₂H ₅OH _(aq)The purpose of H⁺ in the reaction above is to Options:
  A) increase the yield of products
  B) maintain the solution at a constant PH
  C) increase the rate of the hydrolysis
  D) decrease the rate of the reverse reaction
  Show Answer
  The correct answer is A .
• Question 1207: The solubility curve shows the variation of solute concentration with Options:
  A) volume
  B) temperature
  C) vapour density
  D) pressure
  Show Answer
  The correct answer is B .
• Question 1208:

  

  The IUPAC name for the compound is

  Options:
  A) 2,3-dimethylpent-2,3-ene
  B) 2, 3- dimethylpent-2-ene
  C) 3, 4-dimethylpent-3-ene
  D) 3,4-dimethylpentene
  E) 3,4-dimethlhept-2-ene
  Show Answer
  The correct answer is B .
• Question 1209: An example of an alcohol is Options:
  A) CCl₄
  B) CH₃COOH
  C) CHCl₃
  D) C₂H₆
  E) CH₃OH
  Show Answer
  The correct answer is E .
• Question 1210: What is the IUPAC nomenclature of the compound NaCIO? Options:
  A) sodium oxochlorate (I)
  B) sodium chloro (I) oxide
  C) sodium monooxochlorate (II)
  D) sodium chloro (I) monoxide
  Show Answer
  The correct answer is A .