1
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
2
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two pi and half sigma bonds are present in :
A
O2
B
N$$_2^ + $$
C
O$$_2^ + $$
D
N2
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
If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct ?
A
DCM and H2O would stay as upper and lower layer respectively in the separating funnel (S.F.)
B
DCM and H2O will make turbid/colloidal mixture
C
DCM and H2O would stay as lower and upper layer respectively in the separating funnel(S.F).
D
DCM and H2O will be miscible clearly
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