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
According to Freundlich adsorption isotherm, which of the following is correct:-
(1)
(2)
(3)
(4) All are correct for different ranges of pressure
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
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 =
At the critical micelle concentration (CMC) the surfactant molecule
1. deccompose
2. dissociate
3. associate
4. become completely soluble
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
What is the most effective electrolyte for precipitating Fe(OH)3 sol?
1. NaCl
2. BaSO4
3. AlCl3
4. Na3PO4