The phenomenon of the scattering of light by a colloidal solution known as:
1. Zeeman effect.
2. Tyndall effect.
3. Electrophoresis.
4. None of the above.
Colloids can be classified on the basis of:
1. | Physical states of components. |
2. | Nature of dispersed phase. |
3. | Interaction between the dispersed phase and dispersion medium. |
4. | All of the above. |
Select the correct option based on statements below:
Assertion (A): | The coagulation power of Al3+ is more than Na+. |
Reason (R): | Greater the valency of the flocculating ion added, the greater is its power to cause precipitation (Hardy-Schulze rule) |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
The coagulating power of electrolytes with ions Na+, Al3+, and Ba2+for arsenic sulphide sol increases in the order :
1.
2.
3.
4.
Which of the following electrolytes, Na2SO4, CaCl2, Al2(SO4)3, and NH4Cl, is the most effective coagulating agent for Sb2S3 sol?
1. Na2SO4
2. CaCl2
3. Al2(SO4)3
4. NH4Cl
Which of the following statement about collodion is correct?
1. | 4% solution of nitro-cellulose in a mixture of ethyl alcohol and ether. |
2. | 14% solution nitrate in a mixture of ether and ethanol. |
3. | 20 % solution nitrate in a mixture of propanol and diethyl ether. |
4. | None of the above. |
Cloud bursts are caused by?
1. | Attraction towards the electrical charges on the earth. |
2. | Large amount of water present in the cloud. |
3. | Dense clouds are present in the upper atmosphere. |
4. | Mutual discharge of oppositely charged clouds resulting in the coagulation. |
The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below
I. (NaCl) = 52, II. (BeCl2) = 0.69, III. (MgSO4) = 0.22
What is the correct order of their coagulating power?
1. I > II > III
2. II > I >III
3. III > II > I
4. III > I >II
How is the flocculation value expressed?
1. Millimole per litre.
2. Mole per litre.
3. Gram per litre.
4. Mole per millilitre.