Q. No.The index for the Gold number is:
1. Protective power of lyophilic colloid.
2. Purity of gold.
3. Metallic gold.
4. Electroplated gold.
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. |
Peptization is the process of?
1. Precipitating colloidal particles.
2. Purifying colloidal particles.
3. Dispersing the precipitate into a colloidal state.
4. None of the above.
The surface tension of lyophilic sols is:
1. Lower than H2O
2. More than H2O
3. Equal to H2O
4. None of the above.
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
KClO3 on heating decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because:
1. MnO2 decomposes to give oxygen.
2. MnO2 provides heat by reacting.
3. Better contact is provided by MnO2
4. MnO2 acts as a catalyst.
The compound that acts as an inhibitor for knocking in the combustion of petrol is:
1. (C2H5)4Pb
2. Ni(CO)4
3. Both (1) and (2)
4. None of the above.
Water vapours can be both adsorbed and absorbed by respectively ?
1. Silica gel and
2. Chalk and
3. and Silica gel
4. and Chalk
1. The magnitude of the charge on the ion alone
2. Size of the ion alone
3. Both magnitude and sign of the charge on the ion.
4. The sign of the charge on the ion alone.
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