Balance the equation step by step Ch 0,7 0,7 H,O ) . CH →
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Answer:
Solution
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Correct option is A)
The unbalanced redox equation is as follows:
Cr
2
O
7
2−
+C
2
H
4
O+H
+
→C
2
H
4
O
2
+Cr
3+
Balance all atoms other than H and O.
Cr
2
O
7
2−
+C
2
H
4
O+H
+
→C
2
H
4
O
2
+2Cr
3+
The oxidation number of Cr changes from 6 to 3. So the change in oxidation number of one Cr atom is 3.
For 2 Cr atoms, the oxidation number changes by 6.
The oxidation number of C changes from -1 to 0. So the change in oxidation number of 1 C atom is 1.
For 2 C atoms, the oxidation number changes by 2.
The increase in the oxidation number is balanced with decrease in the oxidation number by multiplying
C
2
H
4
O and C
2
H
4
O
2
with 3.
Cr
2
O
7
2−
+3C
2
H
4
O+H
+
→3C
2
H
4
O
2
+2Cr
3+
O atoms are balanced by adding 4 water molecules on RHS.
Cr
2
O
7
2−
+3C
2
H
4
O+H
+
→3C
2
H
4
O
2
+2Cr
3+
+4H
2
O
Hydrogen atoms are balanced by adding 7 H
+
atoms on RHS.
Cr
2
O
7
2−
+3C
2
H
4
O+8H
+
→3C
2
H
4
O
2
+2Cr
3+
+4H
2
O
This is the balanced chemical equation.