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Question
Chemistry
[X] + dil , H2SO4 arrow [Y]: Colourless, suffocating gas [Y] + K2 Cr2 O7 + H2 SO4 arrow Green colouration of solution Then, [X] and [Y] are
Q.
[
X
]
+
d
i
l
,
H
2
S
O
4
→
[
Y
]
: Colourless, suffocating gas
[
Y
]
+
K
2
C
r
2
O
7
+
H
2
S
O
4
→
Green colouration of solution Then, [X] and [Y] are
3419
203
WBJEE
WBJEE 2018
The p-Block Elements - Part2
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A
S
O
3
2
−
,
S
O
2
34%
B
C
l
−
,
H
Cl
23%
C
S
2
−
,
H
2
S
34%
D
C
O
3
2
−
,
C
O
2
9%
Solution:
According to question,
[
X
]
+
Dil.
H
2
S
O
4
⟶
[
Y
]
:
Colourless, suffocating gas
[
Y
]
+
K
2
C
r
2
O
7
+
H
2
S
O
4
⟶
Green colouration of solution.
All sulphites when treated with dil.
H
2
S
O
4
gives colourless and suffocating sulphur dioxide gas.
[
X
]
Sulphite ion
S
O
3
2
−
(
s
)
+
Dil.
H
2
S
O
4
(
a
q
)
→
S
O
4
2
−
(
a
q
)
+
dioxide[Y]
Sulphur
S
O
2
(
g
)
+
H
2
O
(
l
)
S
O
2
gas
[
Y
]
turns acidified potassium dichromate paper green due to reduction of
C
r
(
V
I
)
to
C
r
(
III
)
.
K
2
C
r
2
O
7
(
a
q
)
+
H
2
S
O
4
(
a
q
)
+
[
Y
]
3
S
O
2
(
g
)
⟶
K
2
S
O
4
(
a
q
)
+
Green
C
r
2
(
S
O
4
)
3
(
a
q
)
+
H
2
O
(
l
)