1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Among the following, the energy of 2s orbital is lowest in :
A
Li
B
H
C
Na
D
K
2
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
The pair that has similar atomic radii is :
A
Mo and W
B
Mn and Re
C
Ti and Hf
D
Sc and Ni
3
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
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
4
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The correct sequence of thermal stability of the following carbonates is :
A
BaCO3 < SrCO3 < CaCO3 < MgCO3
B
MgCO3 < CaCO3 < SrCO3 < BaCO3
C
BaCO3 < CaCO3 < SrCO3 < MgCO3
D
MgCO3 < SrCO3 < CaCO3 < BaCO3
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