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Question
Chemistry
Which of the following is used to prepare Cl2 gas at room temperature from concentrated HCl ?
Q. Which of the following is used to prepare
C
l
2
gas at room temperature from concentrated
H
Cl
?
2518
231
WBJEE
WBJEE 2011
The p-Block Elements - Part2
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A
M
n
O
2
0%
B
H
2
S
0%
C
K
M
n
O
4
100%
D
C
r
2
O
3
0%
Solution:
Manganese dioxide
(
M
n
O
2
)
is heated with concentrated
H
Cl
to form
C
l
2
<
b
r
/
>
M
n
O
2
+
4
H
Cl
→
M
n
C
l
2
+
C
l
2
+
2
H
2
O
<
b
r
/
>
H
Cl
in action with potassium permanganate gives
C
2
<
b
r
/
>
2
K
M
n
O
4
+
16
H
Cl
→
2
K
Cl
+
2
M
n
C
l
2
+
8
H
2
O
+
5
C
l
2
.
<
b
r
/
>
Hence option A and C is correct.