Q. No.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.
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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. |
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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. |
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The coagulating power of electrolytes with ions Na+, Al3+, and Ba2+for arsenic sulphide sol increases in the order :
1.
2.
3.
4.
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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
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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. |
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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
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How is the flocculation value expressed?
1. Millimole per litre.
2. Mole per litre.
3. Gram per litre.
4. Mole per millilitre.
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2. Solid in gas.
3. Gas in gas.
4. Liquid in gas.
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