JEE Main 2017 (Online) 8th April Morning Slot | Surface Chemistry Question 99 | Chemistry

This chapter is currently out of syllabus

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JEE Main 2017 (Online) 8th April Morning Slot

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Among the following, correct statement is :

Brownian movement is more pronounced for smaller particles than for bigger–particles

Sols of metal sulphides are lyophilic.

Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.

One would expect charcoal to adsorb chlorine more than hydrogen sulphide.

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

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The Tyndall effect is observed only when following conditions are satisfied:
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

(b) and (d)

(a) and (c)

(b) and (c)

(a) and (d)

JEE Main 2016 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a better protective colloid ?

Gelatin

Gum Arabic

Oleate

Starch

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

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Out of Syllabus

The most appropriate method of making egg-albumin sol is :

Break an egg carefully and transfer the transparent part of the content to 100 mL of 5% w/V saline solution and stir well

Break an egg carefully and transfer only the yellow part of the content to 100 mL of 5% w/V saline solution and stir well.

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the white part of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker.

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the yellow part of the content to 100 mL of 5% w/V saline solutionand homogenize with a mechanical shaker.

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