Question

Which one of the following reaction represent redox reaction ?

• A. $ZnO\left(s\right)+C\left(s\right)\to Zn\left(s\right)+CO\left(g\right)$
• B. $CuO\left(s\right)+H_2\left(s\right)\to Cu\left(s\right)+H_{2}O\left(g\right)$
• C. $2A{g}_{2}O\left(s\right)\to 4Ag\left(s\right)+O_2\left(g\right)$
• D. All of the above.

Answer 1

The correct option is D All of the above.

The reaction in which both oxidation and reduction occur simultaneously is called redox reaction.
a) Removal of oxygen is known as reduction and addition of oxygen is called as oxidation.
$ZnO\left(s\right)+C\left(s\right)\to ZnS\left(s\right)+CO\left(g\right)$ here, removal of oxygen is taking place from $ZnO$ and addition of oxygen to carbon thus it is a redox reaction.
b) Removal of oxygen is known as reduction addition of oxygen is called as oxidation.
$CuO\left(s\right)+H_2\left(s\right)\to Cu\left(s\right)+H_{2}O\left(g\right)$ here, hydrogen is being removed from $CuO$ and oxygen is added to $H_2$ thus it is a redox reaction.
c) Removal of electropositive element is called as oxidation.
$2A{g}_{2}O\left(s\right)\to 4Ag\left(s\right)+O_2\left(g\right)$ $Ag$ is being removed from $A{g}_{2}O$ thus it is a redox reaction .
hemce all option represent redox reaction.