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Redox Reactions
AIIMS 2016
Exam
AIIMS
Year
2016
Subject
Chemistry
Chapter
Redox Reactions
AIIMS 2016 · Chemistry · Redox Reactions
Which of the following can be oxidised by SO_2 ?
Which of the following can be oxidised by
S
O
2
\mathrm{SO}_2
SO
2
?
Options
A
K
2
C
r
2
O
7
\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7
K
2
Cr
2
O
7
B
M
g
\mathrm{Mg}
Mg
C
H
2
O
\mathrm{H}_2 \mathrm{O}
H
2
O
D
All of these
Correct answer
B.
M
g
\mathrm{Mg}
Mg
Step-by-step solution
With
K
2
C
r
2
O
7
,
S
O
2
\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7, \mathrm{SO}_2
K
2
Cr
2
O
7
,
SO
2
works as reducing agent.
K
2
C
r
2
O
7
+
H
2
S
O
4
+
3
S
O
2
⟶
K
2
S
O
4
+
C
r
2
(
S
O
4
)
3
+
H
2
O
\begin{aligned} \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{H}_2 \mathrm{SO}_4+3 \mathrm{SO}_2 \longrightarrow & \mathrm{K}_2 \mathrm{SO}_4+ \\ & \mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3+\mathrm{H}_2 \mathrm{O}\end{aligned}
K
2
Cr
2
O
7
+
H
2
SO
4
+
3
SO
2
⟶
K
2
SO
4
+
Cr
2
(
SO
4
)
3
+
H
2
O
With water the reaction is not a redox reaction,
S
O
2
+
H
2
O
⟶
H
2
S
O
3
2
M
g
+
S
O
2
⟶
2
M
g
O
+
S
3
M
g
+
S
O
2
⟶
2
M
g
O
+
M
g
S
\begin{aligned} & \mathrm{SO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{H}_2 \mathrm{SO}_3 \\ & 2 \mathrm{Mg}+\mathrm{SO}_2 \longrightarrow 2 \mathrm{MgO}+\mathrm{S} \\ & 3 \mathrm{Mg}+\mathrm{SO}_2 \longrightarrow 2 \mathrm{MgO}+\mathrm{MgS}\end{aligned}
SO
2
+
H
2
O
⟶
H
2
SO
3
2
Mg
+
SO
2
⟶
2
MgO
+
S
3
Mg
+
SO
2
⟶
2
MgO
+
MgS
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