1
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
The 71st electron of an element X with an atomic number of 71 enters into the orbital;
A
4f
B
6s
C
6p
D
5d
2
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
The electronegativity of aluminium is similar to :
A
Beryllium
B
Carbon
C
Boron
D
Lithium
3
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
A
B
increase in both atomic and ionic radii
C
decrease in both atomic and ionic radii
D
4
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
When the first electron gain enthalpy $$\left( {{\Delta _{eg}}H} \right)$$ of oxygen is $$-$$ 141 kJ/mol, its second electron gain enthalpy is :
A
a more negative value than the first
B
almost the same as that of the first
C
negative, but less negative than the first
D
a positive value
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