Search SchoolNGR

Monday, 15 June 2026
Register . Login

Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 886:
Which of the following gases is light than air?
  • A CO2
  • B SO2
  • C HCI
  • D NH3
View Answer & Explanation
Question 887:
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
  • A Move at random
  • B Undergo inelastic collisions
  • C Attract each other
  • D Occupy a large volume
View Answer & Explanation
Question 888:
In which of the following compound (s) will heat be absorbed on adding water? l. KNO 3
II. Concentrated H2
SO4 III. NH 4CI
  • A I only
  • B Lll only
  • C L and lll only
  • D Ll and lll only
View Answer & Explanation
Question 889:
Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
  • A An acidic oxide
  • B An oxidizing agent
  • C A basic oxide
  • D A dehydrating agent
View Answer & Explanation
Question 890:
Which of the following compounds is a basic salt?
  • A Mg(NO3)2
  • B (NH4)2SO4
  • C K4Fe(CN)6
  • D Zn(OH)CI
View Answer & Explanation