1
JEE Main 2022 (Online) 27th July Evening Shift
+4
-1

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.

Reason (R) : Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.

In the light of the above statements, choose the correct answer from the options given below :

A
Both (A) and (R) are correct and (R) is the correct explanation of (A)
B
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
C
(A) is correct but (R) is not correct
D
(A) is not correct but (R) is correct
2
JEE Main 2022 (Online) 25th July Evening Shift
+4
-1

For micelle formation, which of the following statements are correct?

A. Micelle formation is an exothermic process.

B. Micelle formation is an endothermic process.

C. The entropy change is positive.

D. The entropy change is negative.

A
A and D only
B
A and C only
C
B and C only
D
B and D only
3
JEE Main 2022 (Online) 29th June Evening Shift
+4
-1

A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol in 2 hours is :

[Given : Molar mass : Na = 23.0 g mol$$-$$1 ; Cl = 35.5 g mol$$-$$1]

A
36 m mol L$$-$$1
B
36 mol L$$-$$1
C
1440 mol L$$-$$1
D
1440 m mol L$$-$$1
4
JEE Main 2022 (Online) 29th June Morning Shift
+4
-1

Which of the following is a correct statement?

A
Brownian motion destabilises sols.
B
Any amount of dispersed phase can added to emulsion without destablising it.
C
Mixing two oppositely charged sols in equal amount neutralises charges and stabilises colloids.
D
Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution.
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