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1
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below :
A
Statement I is true but Statement II is false.
B
Statement I is false but Statement II is true.
C
Both Statement I and Statement II are true.
D
Both Statement I and Statement II are false.
2
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?
A
Nitric acid
B
Sodium hydroxide
C
Ammonia
D
Hydrochloric acid
3
JEE Main 2021 (Online) 25th February Morning Slot
MCQ (Single Correct Answer)
+4
-1
The correct statement about B2H6 is :
A
Its fragment, BH3, behaves as a Lewis base.
B
All B$$-$$H$$-$$B angles are of 120$$^\circ$$.
C
The two B$$-$$H$$-$$B bonds are not of same length.
D
Terminal B$$-$$H bonds have less p-character when compared to bridging bonds.
4
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
The reaction of NO with N2O4 at 250 K gives :
A
N2O3
B
N2O5
C
N2O
D
NO2
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