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1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
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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.
A
(b) and (d)
B
(a) and (c)
C
(b) and (c)
D
(a) and (d)
2
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
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-1
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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 ?
A
Gelatin
B
Gum Arabic
C
Oleate
D
Starch
3
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
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The most appropriate method of making egg-albumin sol is :
A
Break an egg carefully and transfer the transparent part of the content to 100 mL of 5% w/V saline solution and stir well
B
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.
C
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.
D
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.
4
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
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A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :
A
Enthalpy of adsorption is greater than 100 kJ mol−1.
B
Energy of activation is low.
C
Adsorption is monolayer.
D
Adsorption increases with increase in temperature.
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