JEE Main 2022 (Online) 27th June Morning Shift | Surface Chemistry Question 40 | Chemistry

1

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Match List-I with List-II

	List - I		List - II
(A)	Lyophilic colloid	(I)	Liquid-liquid colloid
(B)	Emulsion	(II)	Protective colloid
(C)	Positively charged colloid	(III)	FeCl$$_3$$ + NaOH
(D)	Negatively charged colloid	(IV)	FeCl$$_3$$ + hot water

Choose the correct answer from the options given below :

A

(A) - (II), (B) - (I), (C) - (IV), (D) - (III)

B

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

C

(A) - (II), (B) - (I), (C) - (III), (D) - (IV)

D

(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

2

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Incorrect statement for Tyndall effect is :

A

The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

B

The diameter of the dispersed particles is much smaller than the wavelength of the light used.

C

During projection of movies in the cinemas hall, Tyndall effect is noticed.

D

It is used to distinguish a true solution from a colloidal solution.

3

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :

A

soap particles remain floating in water as ions.

B

the hydrophobic part of soap is not able to take away grease.

C

the micelles are not formed due to concentration of soap, below its CMC value.

D

colloidal structure of soap in water is completely disturbed.

4

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Given below are two statements :

Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing.

Statement II : For stabilisation of an emulsion, excess of electrolyte is added.

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

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.