Search SchoolNGR

Saturday, 13 June 2026
Register . Login

Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1516:
When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of
  • A Calcium oxide
  • B Calcium carbide
  • C Calcium hydrogentrioxocarbonate (IV)
  • D Trioxocarbonate (IV) acid
  • E Calcium trioxocarbonate (IV)
View Answer & Explanation
Question 1517:
Which of the following is a disaccharide?
  • A Fructose
  • B Starch
  • C Cellulose
  • D Sucrose
  • E Glycogen
View Answer & Explanation
Question 1518:
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. Compound X was probably
  • A Rubber
  • B Polyethene
  • C Nylon
  • D Cellulose
  • E Ethanol
View Answer & Explanation
Question 1519:
Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?
  • A Polymerization
  • B Fermentation
  • C Hydrolysis
  • D Neutralization
  • E Esterification
View Answer & Explanation
Question 1520:
The component of air that can be removed by alkaline pyrogallol solution is
  • A Oxygen
  • B Nitrogen
  • C Water vapour
  • D Carbon (IV) oxide
  • E Noble gases
View Answer & Explanation