Tanning of leather is:

(1) Colouring 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%
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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: 

(a)hydrophilic

(b)hydrophobic

(c)reversible

(d)lyophilic

Subtopic:  Colloidal Solution | Lyophilic & Lyophobic Sol |
 76%
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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 |
 84%
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Hardy-Schulze rule states that:

(1) Non-electrolytes have better coagulating action on colloids than electrolytes.

(2) Sols are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge.

(3) Charge of the ions has no effect on the coagulation of a sol.

(4) Sols are coagulated only by those ions whose charge is similar to that of the sol.

 

Subtopic:  Colloidal Solution |
 93%
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An example of intrinsic colloid is:

(a) As2S3 sol                         (b) Fe(OH)3 sol

(c) egg albumin                      (d) Au sol

Subtopic:  Colloidal Solution |
 73%
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Bleeding is stoped by the application of ferric chloride. This is because :

(1) The blood starts flowing in the opposite direction.

(2) The blood reacts and a solid is formed which seals the blood vessel.

(3) The blood is coagulated and the blood vessel are sealed.

(4) The ferric chloride seals the blood vessel.

Subtopic:  Colloidal Solution |
 85%
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Which is not a colloid?

(a) Chlorophyll                                   (b) Egg white

(c) Ruby glass                                    (d) Milk

Subtopic:  Colloidal Solution |
 74%
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Chemisorption is:

(1)multimolecular in nature

(2)reversible

(3)often highly specific and directional

(4)not very specific

Subtopic:  Adsorption and Absorption |
 87%
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Medicines are more effective if they are used in:

(1) Colloidal state

(2) Solid state

(3) Solution state

(4) None of these

Subtopic:  Colloidal Solution |
 90%
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Which is not shown by sols?

(a)Adsorption

(b)Tyndall effect

(c)Flocculation

(d)Paramagnetism

Subtopic:  Lyophilic & Lyophobic Sol |
 84%
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