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Question

Which of the following reactions does not involve oxidation-reduction?

A
2Rb+2H2O2RbOH+H2
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B
2CuI22CuI+I2
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C
NH4Cl+NaOHNaCl+NH3+H2O
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D
4KCN+Fe(CN)2K4[Fe(CN)6]
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Solution

The correct options are
C NH4Cl+NaOHNaCl+NH3+H2O
D 4KCN+Fe(CN)2K4[Fe(CN)6]
The reactions are as follows:
2Rb+2H2O2RbOH+H2
0 +1 +2 0
2CuI22CuI+I2
+2 +1 0
NH4Cl+NaOHNaCl+NH3+H2O
4KCN+Fe(CN)2K4[Fe(CN)6]
As we can see that in (C) and (D), the oxidation numbers of the various elements do not change.
Therefore, they are not redox reactions.

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