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 91:

  The compounds made up of only carbon and hydrogen are called?

  Options:
  A) Carbon compounds
  B) Hydrocarbons
  C) Atoms
  D) Carbon hydrolysis
  Show Answer
  The correct answer is B .
• Question 92:

  The metal used to recover copper from a solution of copper sulphateis?

  Options:
  A) Na
  B) Ag
  C) Hg
  D) Fe
  Show Answer
  The correct answer is D .
• Question 93: A change in the temperature of a saturated solution disturbs the equilibrium between the Options:
  A) Undissolved solute and the solvent
  B) Dissolved solute and the solvent
  C) Dissolved solute and the undissolved solute
  D) Dissolved solute and the solution
  Show Answer
  The correct answer is C .
• Question 94:

  The process or act of extracting a metal from its ore and refining it is called?

  Options:
  A) Extraction
  B) Metal mining
  C) Mettallurgy
  D) Prospecting
  Show Answer
  The correct answer is C .
• Question 95: A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that? Options:
  A) collisions are perfectly elastic
  B) forces of repulsion exist
  C) forces of repulsion are in equilibrium
  D) collision are inelastic
  Show Answer
  The correct answer is A .
• Question 96: Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol^-1] Options:
  A) 0.05
  B) 10.80
  C) 10.00
  D) 0.10
  Show Answer
  The correct answer is D .
• Question 97: Palm wine turns sour with time because? Options:
  A) the sugar content is converted into alcohol
  B) the carbon (IV) oxide formed during the fermentation process has a sour taste
  C) it is commonly adulterated by the tappers and sellers
  D) microbial activity results in the production of orgain acids within it
  Show Answer
  The correct answer is D .
• Question 98: Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the compound P_xQ_Y. The respective values of x and y are? Options:
  A) 1 and 1
  B) 1 and 2
  C) 2 and 1
  D) 3 and 1
  Show Answer
  The correct answer is C .
• Question 99:

  Zn + H₂ SO₄ → ZnSO₄ + H₂

  In the above reaction how much Zinc will be left of 1.0 M of H₂SO?

  [Zn =65, s = 32, O = 16, H = 1]

  Options:
  A) 1.35g
  B) 1.00g
  C) 0.70g
  D) 0.65g
  E) 0.00g
  Show Answer
  The correct answer is A .
• Question 100:

  Which of the following statements does not show Rutherford's account of Nuclear Theory? An atom contains a region

  Options:
  A) which contains protons and neutrons
  B) which is positively charged
  C) which is massive and can cause deflection of a few projectiles
  D) which is very large and in which close to 98% of projectiles pass undeflected
  Show Answer
  The correct answer is C .