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 1841: Hydrogen can be displaced from a hot alkaline solution by Options:
  A) Fe
  B) Cu
  C) Ca
  D) Sn
  Show Answer
  The correct answer is A .
• Question 1842:

  Which functional group is present in alkanals?

  Options:
  A) Carbonyl group (C=O)
  B) Hydroxyl group (-OH)
  C) Alkyl group (-R)
  D) Carboxyl group (-COOH)
  Show Answer
  The correct answer is A .
• Question 1843:

  

  Which of the following compounds will take up the molecules of bromine?

  Options:
  A) l
  B) ll
  C) lll
  D) l and ll
  E) l and lll
  Show Answer
  The correct answer is B .
• Question 1844: Which of the following gases dissolves in water vapour to produce acid rain during rainfall? Options:
  A) Oxygen
  B) Carbon (II) oxide
  C) Nitrogen
  D) Sulphur (IV) oxide
  Show Answer
  The correct answer is D .
• Question 1845:

  A small quantity of solid ammonium chloride (NH₄Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone

  Options:
  A) distillation
  B) sublimation
  C) precipitation
  D) evaporation
  E) decomposition
  Show Answer
  The correct answer is B .
• Question 1846: If the relative molecular mass of an element is not a whole number, it can be deduced that the element is Options:
  A) Naturally radioactive
  B) abundant in nature
  C) a transition metal
  D) an isotopic mixture
  Show Answer
  The correct answer is D .
• Question 1847: Corrosion is exhibited by? Options:
  A) iron only
  B) electropostive metals
  C) metals below hydrogen inthe electrochemical series
  D) all metals
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  The correct answer is D .
• Question 1848: An example of a hygroscopic substance is Options:
  A) CuO _(S).
  B) MgCL_2(S).
  C) CaCL_2(S).
  D) NaOH_(S).
  Show Answer
  The correct answer is A .
• Question 1849: Coal gas is made up of carbon (II) oxide, hydrogen and? Options:
  A) nitrogen
  B) air
  C) argon
  D) methane
  Show Answer
  The correct answer is D .
• Question 1850: The shape of ammonia molecule is? Options:
  A) trigonal planar
  B) octahedral
  C) square planar
  D) tetrahedral
  Show Answer
  The correct answer is A .