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 1481:

  

  Use the graph above to answer this question. The structure of cis-2-butene is

  Options:
  A) A
  B) B
  C) C
  D) D
  Show Answer
  The correct answer is B .
• Question 1482: The ores that can be concentrated by flotation are Options:
  A) nitride ores
  B) sulphide ores
  C) oxide ores
  D) non-metals
  Show Answer
  The correct answer is B .
• Question 1483:

  Crude petroleum is converted to useful products by the processof?

  Options:
  A) fractional crystallization
  B) fractional distillation
  C) filtration
  D) chromatography
  Show Answer
  The correct answer is B .
• Question 1484: Which of the following combinations of conditions may increase the rate of a chemical reaction? Options:
  A) Decrease in temperature, increase in concentration of the reactants
  B) Increase in temperature, addition of a catalyst, decrease in the surface area of the reactants
  C) Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants
  D) Decrease in temperature concentration and surface area of the reactants
  E) Additionof a catalyst and in the absence of light
  Show Answer
  The correct answer is C .
• Question 1485: The shape of s-orbitals is Options:
  A) spherical
  B) elliptical
  C) spiral
  D) circular
  Show Answer
  The correct answer is A .
• Question 1486: Which of the following chloride would exhibit the least ionic character? Options:
  A) MgCl₂
  B) CaCl₂
  C) LiCl
  D) AlCl₃
  Show Answer
  The correct answer is D .
• Question 1487: The carbon atoms on ethane are? Options:
  A) sp² hybridized
  B) sp³ hybridized
  C) sp²d hybridized
  D) sp hybridized
  Show Answer
  The correct answer is B .
• Question 1488:

  

  The graph above demonstrate the effect of

  Options:
  A) surface area on the rate of reaction
  B) catalyst on the rate of reaction
  C) pressure on the rate reaction
  D) concentration on the rate of reaction
  Show Answer
  The correct answer is A .
• Question 1489: If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because Options:
  A) both zinc and copper are metals
  B) the sulphate radical and the zinc ion are divalent
  C) zinc is more electropositive than copper
  D) both zinc and copper form depositive ions in solution
  E) zinc is a reducing agent
  Show Answer
  The correct answer is C .
• Question 1490: Which of the following compounds is a neutral oxide? Options:
  A) Carbon (IV) oxide
  B) Sulphur (Vl) oixide
  C) Sulphur (IV) oxide
  D) Carbon (ll) oxide
  Show Answer
  The correct answer is D .