Milk contains a protein that is very good for health. The protein is:

(a) caffeine

(b) calciferol

(c) keratin

(d) casein

Subtopic:  Colloidal Solution | Lyophilic & Lyophobic Sol |
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The charge on As2S3 sol is due to the adsorption of:

(1) H+                             

(2) OH-

(3) O2-                             

(4) S2-

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

(a) BaSO4

(b) Quiniline

(c) Both (a) and (b)

(d) None of these

Subtopic:  Catalyst |
 75%
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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 |
 76%
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Gas masks containing activated charcoal to remove poisonous gases from atmosphere acts on the principle of:

(1) Adsorption

(2) Absorption

(3) Sorption

(4) All of these

 

Subtopic:  Adsorption and Absorption |
 86%
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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 |
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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 |
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