The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
- A. Moseley
- B. Rutherford
- C. Millikan
- D. Dalton
Diffusion is slowest in solid particles than in particles of liquid and gases because
- A. solid particles have more kinetic energy than the particles of liquid and gases
- B. solid particles have less kinetic energy than the particles of liqiud and gases
- C. solid particles have less restriction in their movement than liquid and gas particles
- D. the particles in solids are far apart and the cohesive forces between them are negligible
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
- A. 243.75 cm3
- B. 369.23 cm3
- C. 738.46 cm3
- D. 1733.36 cm3
16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off at s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]
- A. 22.40 dm3
- B. 11.20 dm3
- C. 2.24 dm3
- D. 1.12 dm3
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]
- A. 0.40g
- B. 0.80g
- C. 4.00g
- D. 8.00g
In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
- A. lower the melting point of the ice
- B. increase the density of the ice
- C. make the ice impure
- D. raise the melting point of the ice
Chlorophyll obtained from green leaves of plant can be shown to be composed of more than one coloured component by the technique of
- A. crystallization
- B. hydrolysis
- C. chromatography
- D. sublimation