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Thursday, 05 March 2026
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Chemistry Past Questions and Answers

Neco Chemistry Questions

Question 16:
Fructose and glucose are ____________
  • A Allotropes of each other.
  • B Both disaccharides
  • C Dimere of each other.
  • D Isomers of each other
  • E Isotopes of each other
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Question 17:
A measure of the degree of disorderliness in a chemical system is known as the ____________
  • A Activation energy
  • B Enthalpy
  • C Entropy
  • D Equilibrium
  • E Free energy.
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Question 18:
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?
  • A 164 cm3
  • B 168 cm3
  • C 179.1.cm3
  • D 201.5cm3
  • E 546 cm3
View Answer & Explanation
Question 19:
if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is ____________
  • A XY
  • B X2Y
  • C XY2
  • D X3Y2
  • E X2Y3
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Question 20:
Which compound is a component of baking powder?
  • A Na2CO3
  • B Na2SO4
  • C KH2CO3
  • D NaHCO3
  • E NaHSO4
View Answer & Explanation