The reaction in which there is a transfer of electrons between the two species occurs is called a redox reaction. The atoms undergo a change in oxidation states.
The following is the redox reaction:
Option A. [tex]\rm ZnS(s) + 2O_{2}(g) \rightarrow ZnSO_{4}(s)[/tex]
The redox reaction can be explained as:
- The loss of an electron by element is called oxidation while its gain is called reduction. Oxidation-reduction is a reaction in which both the loss and gain of an electron occurs.
- The increase in the oxidation number is said to be oxidation while when the oxidation state decreases it is called reduction.
- In the reaction of zinc sulphide with oxygen, the oxidation number of [tex]\rm ZnS[/tex] is -2 while in the product formed zinc sulfate it is 4. It depicts that the [tex]\rm S[/tex] underwent oxidation.
- The oxygen has 0 oxidation number but in [tex]\rm ZnSO_{4}[/tex], it is -2 that is oxygen underwent reduction.
Therefore, reaction A is correct.
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