1
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)
2
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
3
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
4
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
For the following Assertion and Reason, the correct option is
Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements.
Reason : The reactants are most strongly adsorbed on group 7-9 elements.
A
Both assertion and reason are true and the reason is the correct explanation for the assertion.
B
The assertion is true, but the reason is false.
C
Both assertion and reason are true but the reason is not the correct explanation for the assertion.
D
Both assertion and reason are false.
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Physics
Mechanics
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Modern Physics
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Physical Chemistry
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