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 shapes of water, ammonia, carbon (iv) oxide and methane are respectively

  Options:
  A) linear, tetrahedral, angular and pyramidal
  B) angular, pyramidal, linear and tetrahedral
  C) pyramidal, linear, tetrahedral and angular
  D) tetrahedral, angular, pyramidal and linear
  Show Answer
  The correct answer is B .
• Question 2: The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO₃ is? Options:
  A) hydroxyl group
  B) carboalkoxyl group
  C) carbonyl group
  D) carboxyl group
  Show Answer
  The correct answer is D .
• Question 3: The shape of the S-orbital is Options:
  A) elliptical
  B) spiral
  C) circular
  D) spherical
  Show Answer
  The correct answer is D .
• Question 4:

  The electronic configuration of element Z is 1s${}^2$ 2s${}^2$ 2p${}^6$ 3s${}^2$ 3p${}^1$. What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.

  Options:
  A) Z${}_3$(SO${}_4$)${}_2$
  B) ZSO${}_4$
  C) Z${}_2$ SO${}_4$
  D) Z${}_2$(SO${}_4$)${}_3$
  Show Answer
  The correct answer is D .
• Question 5: The alkaline hydrolysis of fats and oils produces soap and Options:
  A) propane 1, 1, 3 - triol
  B) propane - 1,2,3 - triol
  C) propane - 1,3,3 - triol
  D) propane - 1, 2, 2 - triol
  Show Answer
  The correct answer is B .
• Question 6: Two hydrocarbons X and Y were treated with bromine water. X decolorised the solution and Y did not not. Which class of compound does Y belong? Options:
  A) Benzene
  B) Alkynes
  C) Alkenes
  D) Alkanes
  Show Answer
  The correct answer is D .
• Question 7:

  ¹⁴₆C → X + B

  X in the equation above represents

  Options:
  A) ¹²₆C
  B) ¹²₅B
  C) ¹⁴₇N
  D) ¹³₆C
  Show Answer
  The correct answer is C .
• Question 8:

  

  The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

  Options:
  A) the initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant
  B) the occur when large pieces of marble are used and is due to a small surface area of reactant
  C) the initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant
  D) the initial slope of the curve is steepest and this occur when large surface area of reactant
  E) the initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant
  Show Answer
  The correct answer is C .
• Question 9:

  By what amount must the temperature of 200cm${}^3$ of Nitrogen at 27°C be increased to double the pressure if the final volume is 150cm${}^3$ (Assume ideality)

  Options:
  A) 150°C
  B) 177°C
  C) 75°C
  D) 120°C
  Show Answer
  The correct answer is B .
• Question 10: Atomicity of ozone is Options:
  A) 1
  B) 2
  C) 3
  D) 4
  Show Answer
  The correct answer is C .