The simplest way to check whether a system is colloidal is by

• electrodialysis

• finding out particle size

• Tyndall effect

• Brownian movement

Which statement is true?

• The adsorption of H₂ by platinum black is known as sorption

• The adsorption of H₂ by charcoal is known as occlusion

• The adsorption of H₂ by platinum black is known as occlusion

• The absorption of H₂ by charcoal is known as chemisorption.

In the case of auto catalysis

• product catalysis

• solvent catalysis

• reactant catalysis

• heat produced in the reaction catalysis

Which among the following statements is false?

• The adsorption may be monolayered or multilayered

• Particle size of adsorbent will not affect the amount of adsorption

• Increase of pressure increases amount of adsorption

• Increase of temperature may decrease the amount of adsorption

Which of the following is not a characteristic of chemisorption?

• $∆$H is of the order of 400 kJ

• Adsorption is irreversible

• Adsorption may be multimolecular layer

• Adsorption is specific

The concentration of electrolyte required to coagulate a given amount of As₂S₃ solution is minimum in the case of

• magnesium nitrate

• potassium nitrate

• potassium sulphate

• aluminium nitrate

337.

In the manufacture of sulphuric acid by contact process, Tyndall box is used to

• filter dust particles

• remove impurities

• convert SO₂ to SO₃

• test the presence of dust particles

Pick out the statement which is not relevant in the discussion of colloids

• sodium aluminium silicate is used in the softening of hard water

• potash alum is used m shavmg rounds and as a styptic in medicine

• artificial rain is caused by throwing electrified sand on the clouds from an aeroplane

• deltas are formed at a place where the river pours its water into the sea

The diameter of colloidal particles range from

• 10^-6m to 10^-9m

• 10^-9m to 10^-12m

• 10³m to 10^-3m

• 10^-3m to 10^-6 m

Identify the gas which is readily adsorbed by activated charcoal

• N₂

• SO₂

• H₂

• O₂