An electron can be added to a halogen atom to form a halide ion with
- A. 2 valence electrons
- B. 3 valence electrons
- C. 7 valence electrons
- D. 8 valence electrons
A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions?
[C = 12, H = 1, S = 32, O = 16
- A. 5s
- B. 20s
- C. 40s
- D. 60s
It is difficult to achieve an orderly arrangement of the molecules of a gas because they?
- A. have no definite shape
- B. have little force of attraction between them
- C. can collide with one another in the container
- D. are too small in size
According to charles’ law, the volume of a gas becomes zero at
- A. 0 oC
- B. -100 oC
- C. -273 oC
- D. -373 oC
What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of a gas at s.t.p = 22.4 dm\(^3\)
- A. 112 cm2
- B. 224 cm2
- C. 448 cm2
- D. 2240 cm2
If a solution contains 4.9g of tetraoxosulphate (VI) acid, calculate the amount of copper (II) oxide that will react with it
[Cu = 64, O = 16, S = 32, H = 1]
- A. 0.8g
- B. 4.0g
- C. 40.0g
- D. 80.0g
A chemical reaction is always associated with
- A. an increase in the composition of one of the substance
- B. a change in the volume of the reactants
- C. a change in the nature of the reactants
- D. the formation of new substance
When a solid substance disappears completely as a gas on heating, the substance is said to have undergone
- A. evaporation
- B. distillation
- C. crystallization
- D. sublimation