1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of 2-centre-2-electron and 3-centre -2-electron bonds in B2H6, respectively, are :
A
2 and 2
B
2 and 1
C
2 and 4
D
4 and 2
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Good reducing nature of H3PO2 is attributed to the presence of :
A
Two P $$-$$ OH bonds
B
One P $$-$$ H bond
C
Two P $$-$$ H bonds
D
One P $$-$$ OH bond
3
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Correct statements among a to d regarding silicones are :

(a)   They are polymers with hydrophobic character.
(b)   They are biocompatible.
(c)   In general, they have high thermal stability and low dielectric strength.
(d)   Usually, they are resistant to oxidation and used as greases.
A
(a), (b), (c) and (d)
B
(a), (b) and (c) only
C
(a) and (b) only
D
(a), (b) and (d) only
4
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The one that is extensively used as a piezoelectric material is :
A
tridymite
B
amorphous silica
C
quartz
D
mica
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