Chemistry Past Questions And Answers
(a) Name the device used for producing an electric current from a chemical
(b) Copy and complete the table below.
Electrolyte | Product at the anode (carbon) | Product at the cathode (carbon) |
Dilute NaCl\(_{(aq)}\) Concentrated NaCI\(_{(aq)}\) |
What is the main source of carbon monoxide (CO) in urban areas?
- A. Volcanic eruptions
- B. Vehicle emissions
- C. Forest fires
- D. Industrial processes
Which of the following is needed to produce slag during the extraction of iron in the blast furnace?
- A. Cryolite
- B. Limestone
- C. Carbon
- D. Sulphur
A given mass of gas occupies 2dm3 at 300K. At what temperature will its volume be doubled, keeping the pressure constant
- A) 400K
- B) 480K
- C) 550K
- D) 600K
The process that requires the use of hardwater in its operation is
- A) Tanning
- B) Bottling
- C) Laundry
- D) Dyeing
Pure solvents are obtained by
- A) distillation
- B) condensation
- C) extraction
- D) evaporation
Which of the following ions will interact with water to give a solution of pH < 7?
- A)Na+
- B)NH+4
- C) CN?
- D) HCOO?
Which of the following gases can be collected by the upward displacement of air?
- A. NO
- B. H2
- C. NH3
- D. Cl2
The shapes of CO2, H2O and CH4 respectively are
- A) bent, linear and tetrahedral
- B) bent, tetrahedral and linear
- C) tetrahedral, linear and bent
- D) linear, bent and tetrahedral
(a) State the method of collecting gases which are denser than air.
(b) Name two gases that can be used to perform the fountain experiment in the laboratory. State the physical property which makes it suitable for the experiment.
View Discussion (0)WAEC 1992 THEORY