1
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release more energy upon and electron gain are :
A
F, S and Li
B
Cl, Se and Na
C
Cl, S and Li
D
F, Se and Na
2
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The electron gain enthalpy (in KJ/mol) of fluorine, chlorine, bromine and iodine, respectively are:
A
-296, -325, -333 and -349
B
349, -333, -325 and -296
C
-333, -349, -325 and -296
D
-333, -325, -349 and -296
3
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Among the following, the energy of 2s orbital is lowest in :
A
Li
B
H
C
Na
D
K
4
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In comparison to boron, berylium has :
A
lesser nuclear charge and greater first ionisation enthalpy
B
greater nuclear charge and greater first ionisation enthalpy
C
greater nuclear charge and lesser first ionisation enthalpy
D
lesser nuclear charge and lesser first ionisation ethalpy
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