Surface chemistry

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Surface chemistry

Test1 Max. Marks = 40

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1. Which of following statements is false?

4 points

(A) Increase of pressure of a gas causes the amount of adsorption to increase

(B) Increase of temperature may increase or decrease the amount of adsorption

(D) Particle size of the adsorbent does not affect the amount of adsorption

Clear selection

2.The property of colloid is

4 points

(A) Scattering of light

(B) settling under gravity

(D) Emulsion

Clear selection

3.The stability of lyophilic colloid is due to which of the following

4 points

(A) Charge on their particles

(B) Large size of their particles

(D) Solvation by dispersion medium

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4. A colloidal solution is subjected to an electrical field. The particles move towards anode. The coagulation of the same solution is studied using NaCl, BaCl₂ and AlCl₃ solution. Their coagulating power of electrolyte should be in which of the following order:

4 points

(A) NaCl > BaCl₂ > AlCl₃

(B) BaCl₂ > AlCl₃ > NaCl

(D) BaCl₂ > NaCl > AlCl₃

Clear selection

5. Which is the correct statement about milk?

4 points

(A) Milk is an emulsion of fat in water

(B) Milk is an emulsion of protein in water

(D) Milk is stabilized by fat

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6. Surface tension of Lyophilic sol is

4 points

(A) Lower than that of dispersion medium

(B) More than that of dispersion medium

(D) None of these

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7. The size of colloidal particles is

4 points

(A) 1 - 10 A°

(B) 20 - 50 pm

(D) 1 - 200 pm

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8. Tyndall effect is shown by

4 points

(A) Sol

(B) Solution

(D) Precipitate

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9. Which forms multimolecular layer during adsorption

4 points

(A) Physical adsorption

(B) Chemisorption

(D) None of these

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10.For adsorption of gas on solid surface, the plots of log (x/m) vs log P is linear with a slope equal to–

4 points

(A) K

(B) log K

(D) 1/n (n being integer)

Clear selection

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