1
JEE Advanced 2023 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
Change Language
Consider the following statements related to colloids.

(I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium.

(II) For emulsions, both the dispersed phase and the dispersion medium are liquid.

(III) Micelles are produced by dissolving a surfactant in any solvent at any temperature.

(IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium.

The option with the correct set of statements is :
A
(I) and (II)
B
(II) and (III)
C
(III) and (IV)
D
(II) and (IV)
2
JEE Advanced 2022 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
Change Language
Atom $\mathrm{X}$ occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closest to
A
25
B
35
C
55
D
75
3
JEE Advanced 2021 Paper 1 Online
MCQ (Single Correct Answer)
+3
-1
Change Language
For the given close packed structure of a salt made of cation X and anion Y shown below (ions of only one face are shown for clarity), the packing fraction is approximately (packing fraction = $${{packing\,efficiency} \over {100}}$$)

JEE Advanced 2021 Paper 1 Online Chemistry - Solid State & Surface Chemistry Question 16 English
A
0.74
B
0.63
C
0.52
D
0.48
4
JEE Advanced 2013 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-0.75
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25oC. For this process, the correct statement is
A
The adsorption requires activation at 25oC.
B
The adsorption is accompanied by a decrease in enthalpy
C
The adsorption increases with increase of temperature
D
The adsorption is irreversible
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