11. Ethene is produced from ethanol by
- A. decomposition
- B. hydrolysis
- C. ozonolysis
- D. dehydration
12. Consider the following equilibrium reaction: 2AB2(g)+B2(g)→2AB3(g)2AB2(g)+B2(g)→2AB3(g). ΔH=−XkJmol−1ΔH=−XkJmol−1. The backward reaction will be favored by
- A. a decrease in pressure
- B. an increase in pressure
- C. a decrease in temperature
- D. an introduction of a positive catalyst
13.
What is the mass of solute in 500cm3cm3 of 0.005moldm−3moldm−3 H2SO4H2SO4? ( H = 1, S = 32.0, O=16.0)
- A. 0.490g
- B. 0.049g
- C. 0.245g
- D. 0.0245g
14. Pure water can be made to boil at a temperature lower than 100°C by
- A. reducing its quantity
- B. decreasing the external pressure
- C. distilling it
- D. increasing the external pressure
15. 
At what temperature does the solubility of KNO3KNO3 equal that of NaNO3NaNO3?
- A. 0°C
- B. 20°C
- C. 30°C
- D. 40°C
16. When a salt is added to its saturated solution, the salt
- A. dissolves and the solution becomes super saturated
- B. dissolves and the solution becomes unsaturated
- C. precipitates and the solution remains unchanged
- D. dissolves and crystals are formed
17. When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be
- A. propane
- B. propanoic acid
- C. propyne
- D. propanol
18. The preferential discharge of ions during electrolysis is influenced by the
- A. mechanism of electrolysis
- B. electrolytic reactions
- C. nature of the electrode
- D. type of electrolytic cell
19. The valence electrons of 12Mg12Mg are in the
- A. 3s orbital
- B. 2pxx
- C. 2s orbital
- D. 1s orbital
20. Stainless steel is an alloy comprising of
- A. Fe and C
- B. Fe and Ni
- C. Fe, C and Ni
- D. Fe, C and Al
