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
Among the given options, which element is the minimum required for precipitation of a negatively charged suspension of clay in water?
1. Aluminium chloride.
2. Potassium sulphate.
3. Sodium hydroxide.
4. Hydrochloric acid.
What is a colloidal solution that is commonly used to treat skin diseases?
1. Colloidal sulphur.
2. Colloidal silver.
3. Colloidal gold.
4. Colloidal antimony.
How is the flocculation value expressed?
1. Millimole per litre.
2. Mole per litre.
3. Gram per litre.
4. Mole per millilitre.
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.
What does blood contain?
1. Positively charged particles.
2. Negatively charged particles.
3. Neutral particles.
4. Negatively as well as positively charged particles.
What results are obtained from adding FeCl3 to K4[Fe(CN)6] in a diluted, cold solution?
1. Prussian blue sol.
2. Fe4[Fe(CN)6]3 sol.
3. Positive sol.
4. All of the above.
What does the name "aquadag" refer to?
1. Cu in water sol.
2. Pt in water sol.
3. Graphite in water sol.
4. None of the above.
Brownian movement is caused by:
1. Colloidal solution.
2. True solution.
3. Suspension having size <1000 m.
4. All 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.