When a catalyst is added to a system the:

(a) equilibrium concentrations are increased

(b)equilibrium concentrations are unchanged

(c) the rate of forward reaction is increased and that of backward reaction is decreases

(d)value of equilibrium constant is decreased

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Clouds, mist, fog and aerosols are colloidal solution of:

(a) solid in a gas

(b) gas in a solid

(c) liquid in a gas

(d) gas in a liquid

Concept Questions :-

Colloidal Solution
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Gold number is the index for:

(a)protective power of lyophilic colloid

(b)purity of gold

(c)metallic gold

(d)electroplated gold

Concept Questions :-

Colloidal Solution
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Silver iodide is used for producing artificial rain because AgI:

(a) is easy to spray at high altitudes

(b) is easy to synthesize

(c) has crystal structure similar to ice

(d) is insoluble in water

Concept Questions :-

Adsorption and Absorption
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Which is an emulsion?

(a) Boot polish                             (b) Lipstic

(c) Shampoo                                (d) All of these

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Egg albumin is:

(a)reversible colloid

(b)lyophilic colloid

(c)protective colloid

(d)all of these

Concept Questions :-

Colloidal Solution
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Which acts as a promoter for nickel in the hydrogenation of oils ?

1. Cu

2. Mo

3. Fe

4. Pt

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In Zeigler-Natta polymerisation of ethylene, the active species is:

(1)AlCl3

(2)Et3Al

(3)CH2CH2

(4)TiIII

 

 

 

 

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Which gas is adsorbed strongly by charcoal?

(a) CO                                (b) N2

(c) H2                                 (d) NH3

Concept Questions :-

Adsorption and Absorption
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The decomposition of H2O2 may be checked by adding a small quantity of phosphoric acid. This is an example of:

(a) neutralization                              (b) negative catalysis

(c) positive catalysis                         (d) catalytic poisoning

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