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Class 12
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Chemistry
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The p-Block Elements
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Group 16 Elements
Group 16 Elements
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Group 16 Elements - General Properties
Example
Definitions
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>
Group 16 Elements - Trends in Chemical Properties
Example
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Anomalous Properties of Oxygen
Example
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Learn with Videos
Introduction of oxygen family
10 mins
Periodic and Physical Properties of Oxygen Family
14 mins
Oxidation state and multiple bonding
16 mins
Hydrides and oxides of Group 16
15 mins
Halides of oxygen family - I
14 mins
Anomalous Behaviour of Oxygen
9 mins
Quick Summary With Stories
Group 16- Occurrence and Atomic properties
3 mins
Group 16-Physical properties
2 mins
Group 16-Chemical properties-I
3 mins
Group 16-Chemical properties-II
4 mins
Anomalous Properties of Oxygen
2 mins
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Important Questions
The formation of the oxide ion,
O
2
−
(
g
)
, from oxygen atom requires first an exothermic and then an endothermic step as shown below:
O
(
g
)
+
e
−
→
O
−
(
g
)
;
Δ
f
H
⊖
=
−
1
4
1
k
J
m
o
l
−
1
O
−
(
g
)
+
e
−
→
O
2
−
(
g
)
;
Δ
f
H
⊖
=
+
7
8
0
k
J
m
o
l
−
1
Thus, process of formation of
O
2
−
in gas phase is unfavourable even though
O
2
−
is isoelectronic with neon. It is due to the fact that:
Hard
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>
An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolourises aqueous solution of acidified
K
M
n
O
4
. Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y, and Z are:
Medium
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>
The increasing order of electron gain enthalpy of the following substances is:
O
<
S
<
S
e
<
T
e
If the order of bond dissociation enthalpy is correct, enter 1 else 0.
Medium
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>
Explain -
H
2
O
is Liquid but
H
2
S
is a gas.
Medium
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>
The oxidation state of sulphur in the anions
S
2
O
4
2
−
,
S
2
O
4
2
−
and
S
2
O
6
2
−
follows the order:
Hard
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>
Among
P
b
S
,
C
u
S
,
H
g
S
,
M
n
S
,
A
g
2
S
,
N
i
S
,
C
o
S
,
B
i
2
S
3
and SnS
2
, the total number of black coloured sulphides are:
Hard
JEE Advanced
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>
The correct boiling point order is:
Medium
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>
In which of the following arrangements, the given sequence is not strictly according to the property indicated against it?
Medium
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>
Give reason oxygen is a gas but sulphur is a solid ?
Medium
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>
Among the hydrides of group
1
6
elements, which has the lowest boiling point?
Hard
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>