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1

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)
Lyophilic sols are more stable than lyophobic sols because :
A
there is a strong electrostatic repulsion between the negatively charged colloidal particles.
B
the colloidal particles have positive charge.
C
the colloidal particles have no charge.
D
the colloidal particles are solvated.

Explanation

In the lyophilic colloids, the colloidal particles are extensively solvated.
2

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)
Tyndall effect is more effectively shown by :
A
true solution
B
lyophilic colloid
C
lyophobic colloid
D
suspension

Explanation

Tyndall effect is observed in lyophobic colloids
3

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)
Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :
A
Fe4[Fe(CN)6]3
B
K5Fe[Fe(CN)6]2
C
HFe[Fe(CN)6]
D
KFe[Fe(CN)6]

Explanation

4

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)
The sol given below with negatively charged colloidal particles is :
A
FeCl3 added to hot water
B
KI added to AgNO3 solution
C
AgNO3 added to KI solution
D
Al2O3.xH2O in water

Explanation

When AgNO3 is added to KI,

Iodide ion gets adsorbed on the surface of AgI. This will result in formation of negatively charged colloids.

When KI is added to AgNO3 following reaction takes place.

Silver cation gets adsorbed on surface of AgI, resulting in formation of positively charged colloids.

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