Waec Chemistry Past Questions For Year 2001
Question 21
A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
- A. H+
- B. Cu2+
- C. OH-
- D. CI-
Question 22
Which of the following substances decomposes when an electric current is passed through it?
- A. Glucose solution
- B. Zinc rod
- C. Hydrochloric acid
- D. Tetrachlormethane
Question 23
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
- A. Oxygen
- B. Hydrogen
- C. Nitrogen
- D. Copper
Question 24
Which of the following polymers contains nitrogen?
- A. Nylon
- B. Polyvinyl chloride
- C. Polyethene
- D. Cellulose
Question 25
One of the products of combustion of pentane in excess air is
- A. pentanol
- B. pentene
- C. nitrogen (ll) oxide
- D. carbon (IV) oxide
