1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
The correct option among the following is :
A
Addition of alum to water makes it unfit for drinking.
B
Colloidal medicines are more effective because they have small surface area.
C
Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.
D
Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
In chromatography, which of the following statements is incorrect for Rf ?
A
Rf value depends on the type of chromatography.
B
Higher Rf value means higher adsorption.
C
Rf value is dependent on the mobile phase.
D
The value of Rf can not be more than one.
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation

$${x \over m} = k{p^{0.5}}$$

Adsorption of the gas increase with :
A
Decrease in p and increase in T
B
Increase in p and decrease in T
C
Decrease in p and decrease in T
D
Increase in p and increase in T
4
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The aerosol is a kind of colloid in which :
A
solid is dispersed in gas
B
gas is dispersed in solid
C
gas is dispersed in liquid
D
liquid is dispersed in water
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