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 1301:

  What is the IUPAC name for the compound CCl${}_4$?

  Options:
  A) Tetrahydrochloride
  B) Tetrachloromethane
  C) Carbon tetrachloride
  D) Chloroform
  Show Answer
  The correct answer is B .
• Question 1302: Which of the following is an example of a mixture? Options:
  A) Common salt
  B) Blood
  C) Sand
  D) Washing soda
  Show Answer
  The correct answer is B .
• Question 1303: Sulphur Options:
  A) forms two alkaline oxides
  B) is spontaneously flammable
  C) burns with a blue flame
  D) conducts electricity in the molten state
  E) is usually stored in the form of sicks in water
  Show Answer
  The correct answer is C .
• Question 1304: When H₂S is passed into a solution of iron (III) chloride, the solution turns Options:
  A) Pale green
  B) Pale red
  C) Brown
  D) Colourless
  Show Answer
  The correct answer is A .
• Question 1305: A metallic oxide which reacts with both HCl and NaOH to give salt and water only can be classified as? Options:
  A) an acidic oxide
  B) a basic oxide
  C) a neutral oxide
  D) an amphoteric oxide
  Show Answer
  The correct answer is D .
• Question 1306: The production of ammonia by the haber process may be represented by the equilibrium equation N₂(g) + 3H₂(g) ↔ 2NH₃ ∆H = -22KJ. Therefore the production of ammonia will be favoured by? Options:
  A) only high pressure
  B) only high temperature
  C) a combination of high temperature and low pressure
  D) a combination of low temperature and high pressure
  E) low pressure
  Show Answer
  The correct answer is D .
• Question 1307: The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (IV) solution is Options:
  A) yellow to purple
  B) orange to green
  C) green to orange
  D) purple to yellow
  Show Answer
  The correct answer is B .
• Question 1308: Soap lather is an example of a colloid in which a? Options:
  A) liquid is dispersed in gas
  B) solid is dispersed in liquid
  C) gas is dispersed in liquid
  D) liquid is despersed in liquid
  Show Answer
  The correct answer is C .
• Question 1309: The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be? Options:
  A) ionic
  B) covalent
  C) dative covalent
  D) metallic
  E) none of the above
  Show Answer
  The correct answer is B .
• Question 1310: In the periodic table, the electrical and thermal conductivities are properties of elements that Options:
  A) decrease across the period and increase down the group
  B) increase across the period and decrease down the group
  C) decrease across the period and down the group`
  D) increase acrosss the period and down the group
  Show Answer
  The correct answer is A .