21.

In which one of the following properties, physiorption and chemisorption resemble each other?

• Force of attraction

• Enthalpy of adsorption

• Temperature effect

• Effect of surface area

List I contains the type of colloid while List II contains the examples.

List I	List II
A. Sol	p. Dust
B. Aerosol	q. Cheese
C. Gel	r. Soap lather
D. Foam	s. Plant cell fluid

Choose the correct match.

• A - s; B - r; C - p; D - q

• A - s; B - p; C - q; D - r

• A - r; B - s; C - q; D - p

• A - r; B - p; C - s; D - q

Gold sol can be prepared by

• reduction of gold (Ill) chloride with formalin solution

• hydrolysis of gold (III) chloride

• oxidation of gold by aqua-regia

• peptization

Which one of the following is an example for multimolecular colloid?

• Sulphur sol in water

• Aqueous starch sol

• Aqueous enzyme sol

• Alcoholic polystyrene sol

The disease kalaazar is cured by

• colloidal antimony

• milk of magnesia

• argyrols

• colloidal gold

Which is correct about physical adsorption?

• High temperature and high pressure favour adsorption

• High temperature and low pressure favour adsorption

• Low temperature and high pressure favour adsorption

• Low temperature and low pressure favour adsorption

Associated colloid among the following is

• sodium stearate

• enzymes

• proteins

• cellulose

The dispersed phase and dispersion medium in soap lather are respectively

• gas and liquid

• liquid and gas

• solid and gas

• solid and liquid

In petrochemical industry, alcohols are directly converted to gasoline by passing over heated

• platinum

• ZSM-S

• iron

• nickel

The ion that is more effective for the coagulation of As₂S₃ sol is

• Al³⁺

• Ba²⁺

• Na⁺

• SO${}_4^{2-}$