Waec Chemistry Past Questions
Question 36
The major raw material in a plastic industry is
- A. ethanol
- B. sulphur
- C. methylethanoate
- D. ethene
- E. ethane
Question 37
During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm3 at s.t.p)
- A. 0.224 dm3
- B. 0.280 dm3
- C. 0.560 dm3
- D. 2.24 dm3
- E. 22.4 dm3
Question 38
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)
- A. - 4176 J
- B. +4176 J
- C. - 900 J
- D. + 900 J
- E. +8100 J
Question 39
The following are miscible with water except
- A. ethylethanoate
- B. methanol
- C. ethanoic acid
- D. methanoic acid
- E. ethanol
Question 40
The most suitable method to use when separating an insoluble solid from a liquid is
- A. evaporation
- B. filtration
- C. magnetization
- D. sublimation
- E. distillation
