A) \[{{\operatorname{CaCO}}_{3}}\, \xrightarrow{{}} CaO+C{{O}_{2}}\]
B) \[Na+{{H}_{2}}O\xrightarrow{{}}\,NaOH+\frac{1}{2}{{H}_{2}}\]
C) \[\operatorname{MnC}{{l}_{3}} \xrightarrow{{}} MnC{{l}_{2}}\,+\,\frac{1}{2}\,C{{l}_{2}}\]
D) \[{{O}_{2}}+2{{H}_{2}}\xrightarrow{{}}2{{H}_{2}}O\]
Correct Answer: A
Solution :
Redox reaction means, the reaction in whoa oxidation as well as reduction takes place simultaneously. \[\operatorname{Ca}\overset{+\,4}{\mathop{C{{O}_{3}}}}\,\,\,\xrightarrow{{}}\,\,C{{a}^{+\,2}}{{O}^{-\,2}}+{{C}^{+\,4}}O_{2}^{-\,2}\] In this reaction there is no change in oxidation number of any atom. Hence this reaction is no: a redox reaction.
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