1
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Identify the incorrect statement :
A
S2 is paramagnetic like oxygen.
B
Rhombic and monoclinic sulphur have S8 molecules.
C
S8 ring has a crown shape.
D
The S-S-S bond angles in the S8 and S6 rings are the same.

Explanation



S8 ring has crown shape and bond angle is 107o

S6 ring has chair form hexagon ring and bond angle is 102.2o.
2
MCQ (Single Correct Answer)

JEE Main 2017 (Offline)

The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are:
A
Cl- and $$ClO_2^ - $$
B
ClO- and $$ClO_3^ - $$
C
Cl- and ClO-
D
$$ClO_2^ - $$ and $$ClO_3^ - $$

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 8th April Morning Slot

A metal ‘M’ reacts with nitrogen gas to afford ‘M3N’. ‘M3N’ on heating at high temperature gives back ‘M’ and on reaction with water produces a gas ‘B’. Gas ‘B’ reacts with aqueous solution of CuSO4 to form a deep blue compound. ‘M’ and ‘B’ respectively are :
A
Li and NH3
B
Ba and N2
C
Na and NH3
D
Al and N2

Explanation

4
MCQ (Single Correct Answer)

JEE Main 2017 (Online) 8th April Morning Slot

The number of S = O and S − OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :
A
(2 and 2) and (2 and 2)
B
(2 and 4) and (2 and 4)
C
(4 and 2) and (2 and 4)
D
(4 and 2) and (4 and 2)

Explanation

Peroxidisulphuric Acid (H2 S2 O8) :

Number of S = O, bonds = 4

Number of S $$-$$ OH, bond = 2

Pyrosulphuric Acid (H2 S2 O7) :

Number of S = O, bonds = 4

Number of S $$-$$ OH, bonds = 2

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