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Questions
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1
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
A
increase in atomic radii and decrease in ionic radii
B
increase in both atomic and ionic radii
C
decrease in both atomic and ionic radii
D
decrease in atomic radii and increase in ionic radii
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
3
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In general, the properties that decrease and increase down a group in the periodic table, respectively, are :
A
Atomic Radius and Electronegativity
B
Electron Gain Enthalpy and Electronegativity.
C
Electronegativity and Atomic Radius.
D
Electronegativity and Electron Gain Enthalpy.
4
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :
A
inert pair effect
B
diagonal relationship
C
lattice structure
D
lanthanoid contraction
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