The charge on As2S3 sol is due to to the adsorbed:-

(1) H+

(2) OH-

(3) O-2

(4) S-2

Concept Questions :-

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In the langmuir adsorption isotherm, the postulates were:-

(A) Adsorption of a gas molecule at a particular site depends on neighboring sites.

(B) Gases undergoes adsorption behave ideally

     (1) Only A is correct

     (2) Only B is correct

     (3) Both are correct

     (4) None of these

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The most suitable electrolyte for the coagulation of arsenic sulphide will be:-

(1) AlCl3

(2) BaCl2

(3) NaCl

(4) KCl

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According to freundlich adsorption isotherm, which of the following is correct:-

(1) xmα p°

(2) xmα p

(3) xmα p1/n

(4) All are correct for different ranges of pressure

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Colloidal solution of gold prepared by different methods of different colours because of:

1. different diameters of colloidal gold particles

2. variable valency of gold

3. different concentration of gold particles

4. impurities produced by different methods

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Which one has the highest coagulation power?

(1) K+

(2) Ca++

(3) Al+++

(4) Sn4+

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Adsorption of log(x/m) and log P was found of the following type. This is true when:-

(1) n=

(2) 1/n = 1

(3) P=0

(4) 1/n = 

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At the critical micelle concentration (CMC) the surfactant molecule

1. deccompose

2. dissociate

3. associate

4. become completely soluble

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10 mg starch protected 5 ml gold sol in 1 ml 2% NaCl solution. The gold number of starch is:

1. 20               2. 40

3. 80               4. 100

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Which electrolyte is most effective for the precipitation of Fe(OH)3 sol?

1. NaCl             2. BaSO4

3. AlCl3            4. Na3PO4

Concept Questions :-

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