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1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The element that usually does NOT show variable oxidation states is :
A
V
B
Cu
C
Sc
D
ti
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
3
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Wilkinson catalyst is : (Et = C2H5)
A
[(Ph3P)3 RhCl]
B
[(Et3P)3RhCl]
C
[(Et3P)3IrCl]
D
[(Ph3P)3IrCl]
4
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
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