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Tuesday, 19 May 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 216:
JAMB 1981
Sodium and potassium belong to the same group of the Periodic Table. This is because?
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  • A Both are metals
  • B Both are soft and lighter than water
  • C Both form cations by losing electrons
  • D Both have identical electronic configuration
  • E Both react with water vigorously
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Question 217:
JAMB 1981
Oxidation is the process of?
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  • A Gain of electrons
  • B Loss of electrons
  • C Gain of hydrogen
  • D Loss of oxygen
  • E Addition of an electropositive element to a substance
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Question 218:
JAMB 1981
the number of atoms in one mole of a substance is equal to?
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  • A The atomic number
  • B The avogadro number
  • C The gas constant
  • D The number of neutrons
  • E The number of electrons
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Question 219:
JAMB 1981
Which of the following statements is NOT true of electrovalent compounds?
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  • A They are solids
  • B They do not vaporized easily
  • C They usually dissolve in water
  • D The elements forming the compounds normally have their valency electrons in a shared state
  • E They conduct electricity
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Question 220:
JAMB 1981
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
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  • A A drying agent
  • B An oxidizing agent
  • C A dehydrated agent
  • D A reducing agent
  • E A hydrolysing agent
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