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 301: Starch can be converted to ethyl alcohol by Options:
  A) distillation
  B) fermentation
  C) isomerization
  D) cracking
  E) cooking
  Show Answer
  The correct answer is B .
• Question 302:

  

  The two functional groups in the above compound are

  Options:
  A) alcohol and amine
  B) acid and amine
  C) aldehyde and acid
  D) ketone and amine
  Show Answer
  The correct answer is B .
• Question 303:

  The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

  Options:
  A) carbon(IV)oxide
  B) carbon(ll)oxide
  C) soda
  D) glucose
  Show Answer
  The correct answer is A .
• Question 304: According to charles' law, the volume of a gas becomes zero at Options:
  A) 0 ^oC
  B) -100 ^oC
  C) -273 ^oC
  D) -373 ^oC
  Show Answer
  The correct answer is C .
• Question 305: What is the pH of 0.001 mol dm^-3 solution of sodium hydroxide Options:
  A) 14
  B) 13
  C) 12
  D) 11
  Show Answer
  The correct answer is D .
• Question 306:

  16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p

  [Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm³]

  Options:
  A) 22.40 dm³
  B) 11.20 dm³
  C) 2.24 dm³
  D) 1.12 dm³
  Show Answer
  The correct answer is C .
• Question 307: The modern process of manufacturing steel for iron is by Options:
  A) treatment with acids
  B) oxidation
  C) blast reduction
  D) treatment with alkanal
  Show Answer
  The correct answer is C .
• Question 308:

  Isotopes of an element have

  Options:
  A) The same number of protons but different numbers of neutrons.
  B) The same number of neutrons and electrons
  C) The same number of protons and neutrons
  D) The same number of protons and electrons
  Show Answer
  The correct answer is A .
• Question 309:

  Chromatography is used to separate components of mixture which differ in their rates of ?

  Options:
  A) diffusion
  B) migration
  C) reaction
  D) sedimentation
  Show Answer
  The correct answer is B .
• Question 310: 2.0g of a monobasic acid was made up to 250 cm³ with distilled water. 25.00 cm³ of this solution required 20.00cm³ of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is? Options:
  A) 200 g
  B) 160 g
  C) 100 g
  D) 50 g
  Show Answer
  The correct answer is C .