41. In the laboratory preparation of oxygen, the gas cannot be collected by displacement of air because
- A. The density of oxygen is greater than that of air
- B. The density of air is nearly the same as that of oxygen
- C. Oxygen is a component of air
- D. Air is an impure substance
42.
2KClO3(g) MNO3→ 2KCl(s) + 3O2(g)
The importance of the catalyst in the reaction above is that
- A. Heating may not be required before the reaction takes place
- B. The reaction is controllable even at a high temperature
- C. The reaction produces large quantity of oxygen
- D. The reaction takes place more rapidly at a lower temperature
43. Which of the following is used to power steam engines?
- A. Lubricating oil
- B. Coal
- C. Bitumen
- D. Diesel oil
44. In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?
- A. 5 cm3
- B. 10 cm3
- C. 20 cm3
- D. 50 cm3
45. To what volume must 300cm3 of 0.60M sodium hydroxide solution be diluted to give a 0.40M solution?
- A. 450 cm3
- B. 300 cm3
- C. 200cm3
- D. 150 cm3
46. Diamond is a bad conductor of electricity because its bonding electrons are used in
- A. Crystal lattice formation
- B. Covalent bond formation
- C. Metallic bond formation
- D.Coordinate bond formation
47. The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
- A. Saponification
- B. Dehydration
- C. Esterification
- D. Hydrolysis
48. The constituent common to duralumin and alnico is
- A. Co
- B. Mn
- C. AI
- D. Mg
49. The solubility of the solids that dissolves in a given solvent with the liberation of heat will
- A. Increase with an increase in temperature
- B. Decrease with an increase in temperature
- C. Decrease with an decrease in temperature
- D. Not be affected by changes in temperature
50. What mass of Cu would be produced by the cathodic reduction of Cu^2+ when 1.60A of current passes through a solution of CuSO4 for 1 hour. (F=96500Cmol−1 , Cu=64)
- A. 7.64g
- B. 3.82g
- C. 1.91g
- D. 0.96g
