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 1: The isomers of C₃H₈O ARE Options:
  A) 1 - propanol and 2 - propanol
  B) 1 - propanol and 1 - propanol
  C) 2 - propanol and 2 - propanone
  D) 2 - propanol and 1 - propanol
  Show Answer
  The correct answer is A .
• Question 2: How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C ₄H₁₀O? Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is D .
• Question 3: How much of magnesium is required to react with 260cm³ of 0.5 M HCl? [Mg = 24] Options:
  A) 0.3g
  B) 1.5g
  C) 2.4g
  D) 3.0g
  Show Answer
  The correct answer is B .
• Question 4: The uncovered raw food that is sold along major roads is likely to contain some amounts of Options:
  A) Pb
  B) Cu
  C) Ag
  D) Na
  Show Answer
  The correct answer is A .
• Question 5: The salt formed from a weak acid and a strong base hydrolyzes in water to form Options:
  A) A saturated solution
  B) an acidic solution
  C) a buffer solution
  D) an alkaline solution
  Show Answer
  The correct answer is D .
• Question 6: Sulphur exists in six forms in the solid state. This property is known as? Options:
  A) isomerism
  B) allotropy
  C) isotopy
  D) isomorphism
  Show Answer
  The correct answer is B .
• Question 7:

  The end products of burning a candle in the atmosphere are water and 

  Options:
  A) carbon (II) oxide
  B) sulphur (IV) oxide
  C) carbon (IV) oxide
  D) sulphur (VI) oxide
  Show Answer
  The correct answer is C .
• Question 8:

  A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm³ container at 20°C. The number of moles of gas in the sample is?

  (R = 0.082 litre atm / deg mole)

  Options:
  A) 1.00
  B) 2.00
  C) 3.00
  D) 4.00
  Show Answer
  The correct answer is A .
• Question 9: Which of the following statements is FALSE? Options:
  A) Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
  B) Sodium metal dissolves in water giving oxygen
  C) Nitrogen is insoluble in water
  D) Carbondioxide is soluble in water
  E) lead has a higher atomic weight than copper
  Show Answer
  The correct answer is B .
• Question 10:

  SO${}_2$ + O${}_2$ 2SO${}_3$

  In the reaction above, the most suitable catalyst is?

  Options:
  A) chromium(vi)oxide
  B) iron(iii)oxide
  C) copper(i)oxide
  D) vanadium(v)oxide
  Show Answer
  The correct answer is D .