1
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
Find A, B and C in the following reactions :

$$N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}$$

$${(N{H_4})_2}C{O_3} + {H_2}O + B \to N{H_4}HC{O_3}$$

$$N{H_4}HC{O_3} + NaCl \to N{H_4}Cl + C$$
A
$$A - {O_2};B - C{O_2};C - N{a_2}C{O_3}$$
B
$$A - {H_2}O;B - {O_2};C - NaHC{O_3}$$
C
$$A - {H_2}O;B - {O_2};C - N{a_2}C{O_3}$$
D
$$A - {H_2}O;B - C{O_2};C - NaHC{O_3}$$
2
JEE Main 2021 (Online) 25th February Evening Shift
+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.
3
JEE Main 2021 (Online) 25th February Evening Shift
+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
4
JEE Main 2021 (Online) 25th February Morning Slot
+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.
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