Which of the following is not applicable to chemisorption?

1. Its heat of adsorption is high

2. It takes place at high temperature

3. It is reversible

4. It forms unimolecular layer

As₂S₃ sol is

1. possible colloid                 
2. negative colloid
3. neutral colloid                 
4. none of the above

What is the most effective electrolyte for precipitating Fe(OH)₃ sol?

1. NaCl             

2. BaSO₄

3. AlCl₃           

4. Na₃PO₄

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

At the critical micelle concentration (CMC) the surfactant molecule

1. deccompose

2. dissociate

3. associate

4. become completely soluble

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

1. n = $\infty$

2. 1/n = 1

3. P = 0

4. 1/n = $\infty$

Which one has the highest coagulation power?

1. K⁺

2. Ca⁺⁺

3. Al⁺⁺⁺

4. Sn⁴⁺

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

(1) H⁺

(2) OH^-

(3) O^-2

(4) S^-2

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

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

1. AlCl₃

2. BaCl₂

3. NaCl

4. KCl