1
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log $${x \over m}$$ versus log p gives a straight line with slope equal to 0.5, then:

( $${x \over m}$$ is the mass of the gas adsorbed per gram of adsorbent)
A
B
Adsorption is proportional to the pressure.
C
Adsorption is proportional to the square root of pressure.
D
Adsorption is proportional to the square of pressure.
2
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
Among the following, correct statement is :
A
Brownian movement is more pronounced for smaller particles than for bigger–particles
B
Sols of metal sulphides are lyophilic.
C
Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
D
One would expect charcoal to adsorb chlorine more than hydrogen sulphide.
3
JEE Main 2017 (Offline)
+4
-1
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)
4
JEE Main 2016 (Online) 10th April Morning Slot
+4
-1
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
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