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Standard VIII
Chemistry
Properties of Sulphur Dioxide
Violet vapors...
Question
Violet vapors are given out when _________ is treated with
c
o
n
c
.
H
2
S
O
4
.
A
bromide
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B
iodide
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C
chloride
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D
nitrate
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Solution
The correct option is
B
iodide
Violet vapours are given out when iodide is treated with conc.
H
2
S
O
4
.
N
a
I
+
H
2
S
O
4
→
H
I
+
N
a
H
S
O
4
H
2
S
O
4
+
2
H
I
→
I
2
(violet vapours)
+
S
O
2
+
2
H
2
O
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