1
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2$$-$$ ?
A
$$Li_2^ + $$ is unstable and $$Li_2^ - $$ is stable
B
$$Li_2^ + $$ is stable and $$Li_2^ - $$ unstable
C
Both are stable
D
Both are unstable
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The alkaline earth metal nitrate that does not crystallise with water molecules, is :
A
Mg(NO3)2
B
Sr(NO3)2
C
Ca(NO3)2
D
Ba(NO3)2
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
Out of Syllabus
Change Language
A water sample has ppm level concentration of the following metals : Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is :
A
Cu
B
Mn
C
Fe
D
Zn
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