MCQShareWhich of the following is not a redox reaction?A $\text{CaCO}_3\xrightarrow{ \ \ \ \ \ \ \ }\text{CaO}+\text{CO}_2$ B $2\text{H}_2+\text{O}_2\xrightarrow{ \ \ \ \ \ \ }2\text{H}_2\text{O}$ C $2\text{Na}+2\text{H}_2\text{O}\xrightarrow{ \ \ \ \ \ \ \ }2\text{NaOH}+\text{H}_2$ D $\text{MnCl}_3\xrightarrow{ \ \ \ \\ \ \ \ }\text{MnCl}_2+\frac{1}{2}\text{Cl}_2$