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.

Subtopic:  Colloidal Solution |
 83%
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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.

Subtopic:  Colloidal Solution |
 59%
From NCERT
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Which acts as poison for Pd-charcoal in lindlar's catalyst ?

1. BaSO4

2. Quiniline

3. Both 1. and 2.

4. None of these

Subtopic:  Catalyst |
 67%
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Which is the electrolyte that is least effective in causing coagulation of +ve ferric hydroxide sol?

1. KBr

2. K2SO4

3. K2CrO4

4. K3[Fe(CN)6]

Subtopic:  Colloidal Solution |
 66%
From NCERT
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Platinized asbestos used as a catalyst in the manufacture of H2SO4 is an example of:

1. heterogeneous catalyst                   

2. auto-catalyst

3. homo-catalyst                                 

4. induced catalyst

Subtopic:  Catalyst |
 78%
From NCERT
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In a reversible reaction, a catalyst:

1. increases the rate of the forward reaction only

2. increases the rate of the forward reaction to a greater extent than that of  the backward reaction

3. increases the rate of the forward reaction and decreases that of the backward reaction to the different extent

4. increases the rate of the forward and backward reactions equally

Subtopic:  Catalyst |
 73%
From NCERT
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Gas masks containing activated charcoal remove poisonous gases from the atmosphere, and act on the principle of:

1. Adsorption

2. Absorption

3. Sorption

4. All of these

Subtopic:  Adsorption and Absorption |
 80%
From NCERT
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Tanning of leather is:

1. coloring of leather by chemicals

2. drying process to make the leather hard

3. polishing of leather to make it look attractive

4. coagulative hardening of the leather by chemicals

Subtopic:  Colloidal Solution |
 76%
From NCERT
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When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is: 

1. hydrophilic

2. hydrophobic

3. reversible

4. lyophilic

Subtopic:  Colloidal Solution | Lyophilic & Lyophobic Sol |
 73%
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The Critical Micelle Concentration (CMC) is:

1. The concentration at which micellization starts

2. The concentration at which true solution is formed

3. The concentration at which one molar electrolyte is present per 1000 g of solution

4. The concentration at which solute and solution from equilibrium

Subtopic:  Emulsions |
 80%
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