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A : Starch and gelatin are lyophillic co...

A : Starch and gelatin are lyophillic colloid.
R : They have strong interaction, with the dispersion medium

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, mark (1)

B

If both Assertion & Reason are true but reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Resson are false statements , then mark (4)

Text Solution

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The correct Answer is:
A
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each question contain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: Protein, starch are lyophilic colloids. STATEMENT-2: They have strong interaction with the dispersion medium.

Check whether the statement is correct or not : Stability of lyophilic colloids is mainly due to the strong interaction between dispersed particle and dispersion medium.

Viscosity of lyophilic colloidal solution is same as that of dispersion medium. True/False

How are the colloidal classified on the basis of the nature of interaction between dispersed phase and dispersion medium? Describe an important characteristic of each class. Which of these sols need stabilising agents for preservaion?

Which is not the characteristic of hydrophobic sols? a. They are highly susceptible to coagulation by addition of electrolytes. b. They have nearly the same surface tension and viscosity as that of dispersion medium. c. Their stability is due to both electric charge and salvation of the particles. d. Sol particles can be seen under ultramicroscope.

The colloidal system of a solid dispersed in liquid medium is :

A certain colloidal solution is not affected by the addition of small amounts of electrolytes. (i) What type of a sol is it? (ii) Compared to that of the dispersion medium what would you expect the surface tension and viscosity of the sol to be? (iii) Will the colloidal particles be easily detectable in an ultramicroscope? (iv) Give an example of such a sol.

How are colloids classified on the basis of (i) physical states of components (ii) nature of dispersion medium (iii) interaction between dispersed phase and dispersion medium ?

Correct the following statements by changing the underlined part of the sentence (Do not change the whole sentence) Viscosity of a lyophilic sol is ul("same as that of dispersion medium.")

the protective power of the lyophilic colloids es expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of milli - gram of the protective colloid which prevent the coagulation of 10 mLof red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. On addition of one mL of sloution of 10 % NaCl to 10 mL. of red gold sol in presence of 0.025 g of starch the coagultion is just prevented . the gold number of starch is