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Chemistry Question on Redox reactions

Which of the following is not a redox reaction?

A

\ce2Na+Cl2−>2NaCl\ce{2 Na + Cl_2 -> 2 NaCl}

B

\ceC+O2−>CO2\ce{C + O_2 -> CO_2}

C

\ceAgNO3+NaCl−>Aga+NaNO3\ce{AgNO_3 + NaCl -> Aga + NaNO_3}

D

\ceZn+H2SO4−>ZnSO4+H2\ce{Zn + H_2SO_4 -> ZnSO_4 + H_2}

Answer

\ceAgNO3+NaCl−>Aga+NaNO3\ce{AgNO_3 + NaCl -> Aga + NaNO_3}

Explanation

Solution

None of the element in reaction (c) undergoes a change in ON., therefore, (c) is not a redox reaction. {\overset{\text{+1 }}{ { Ag}} \overset{\text{+5 }}{ { N}}\overset{\text{-2 }}{ { O}}$_3 + $\overset{\text{+1 }}{ { Na}}$ $\overset{\text{-1 }}{ { Cl}}$ -> $\overset{\text{+1 }}{ { Ag}}$ $\overset{\text{-1 }}{ { Cl}}$ + $\overset{\text{+1 }}{ { Na}}\overset{\text{+5 }}{ { N}}$$\overset{\text{-2 }}{ { O}}_3} In fact, it is a double decomposition reaction.