question_answer

Is the following reaction a redox reaction is nature? Justify your answer. \[C{{r}_{2}}O_{7}^{2-}\,+{{H}_{2}}O\xrightarrow{\,}\,2CrO_{4}^{2-}\,+2{{H}^{+}}\]

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.