Answer:
The O.N. of different elements in the reaction are:
\[{{({{\overset{+6}{\mathop{Cr}}\,}_{2}}\overset{-2}{\mathop{O}}\,_{7}^{{}}\,)}^{2-}}+{{\overset{+1}{\mathop{H}}\,}_{2}}\overset{-2}{\mathop{O}}\,\xrightarrow{\,}\,2\overset{+6}{\mathop{Cr}}\,O_{4}^{-2}{{)}^{2-}}\,+{{(2\overset{+1}{\mathop{H}}\,)}^{+}}\]
Since there is no change in O.N. of the elements involved in the reaction, it is not an example of redox reaction.
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