1
JEE Main 2020 (Online) 3rd September Morning Slot
+4
-1
Tyndall effect is observed when:
A
The diameter of dispersed particles is similar to the wavelenght of light used.
B
The diameter of dispersed particles is much smaller than the wavelength of light used.
C
The diameter of dispersed particles is much larger than the wavelength of light used.
D
The refractive index of dispersed phase is greater than that of the dispersion medium.
2
JEE Main 2020 (Online) 2nd September Evening Slot
+4
-1
Amongst the following statements regarding adsorption, those that are valid are

(a) $$\Delta$$H becomes less negative as adsorption proceeds
(b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas
(c) On adsorption, the residual force acting along the surface of the adsorbent increases
(d) With increase in temperature, the equilibrium concentration of adsorbate increases
A
(c) and (d)
B
(a) and (b)
C
(d) and (a)
D
(b) and (c)
3
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
Which of the following is used for the preparation of colloids?
A
Van Arkel Method
B
Bredig’s Arc Method
C
Mond Process
D
Ostwald Process
4
JEE Main 2020 (Online) 9th January Evening Slot
+4
-1
A mixture of gases O2, H2 and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :
A
B
C
D
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