Question

All of the following are redox reactions, except

• A.
  
• B.
• C.
• D.

Answer 1

The correct option is C

The reactions in which oxidation and reduction take place simultaneously and there is a change in oxidation number of elements in reactants and products are called redox reactions.


In the reaction, oxidation states of Ca, C, and O remain the same in reactants as well as products, therefore, it is not a redox reaction.

Hence, the correct answer is option (c).