Waec Chemistry Past Questions For Year 1993
Question 11
What does X atand for in the following expression? X = Log(10)(H+)
- A. Enthalpy change (∆H)
- B. Equilibrium constant (K)
- C. Solubility product
- D. Degree of acidity (pH)
- E. lonic product of water
Question 12
Carbon is often deposited in the exhaust-pipe of cars because of the?
- A. presence of carbon in petrol
- B. dehydrogenation of petrol
- C. incomplete combustion of petrol
- D. presence of additives in petrol
- E. contamination of petrol with diesel
Question 13
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
- A. 600cm-3
- B. 800cm-3
- C. 1,000cm-3
- D. 3,600cm-3
- E. 4,000cm-3
Question 14
The following gases decolorize bromine water except
- A. C2H6
- B. C2H4
- C. C2H2
- D. C3H4
- E. C3H6
Question 15
Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
- A. Stirring the mixture vigorously
- B. Adding more calcium chloride solution
- C. lncreasing the concentration of the ethanedioic acid
- D. Adding concentrated hydrochloric acid
- E. Adding some distilled water
