Identify the substance that is reduced in the following reaction.
ZnO+C→Zn+CO

Correct option is A

The correct answer is (a) ZnO.
Explanation: In the given reaction:
ZnO+C→Zn+CO
· Reduction is the process of gaining electrons or decreasing oxidation state.
· Oxidation is the process of losing electrons or increasing oxidation state.
Let's break down the oxidation states:

•  Zinc oxide (ZnO): Zinc (Zn) has an oxidation state of +2, and oxygen (O) has an oxidation state of -2.
  
•  Zinc (Zn): In the product side, zinc is in its elemental form, so its oxidation state is 0.
  
• Carbon (C): Carbon in CO has an oxidation state of +2 (in carbon monoxide).

The ZnO (zinc oxide) is reduced because zinc's oxidation state changes from +2 to 0 (a decrease in oxidation state, which indicates reduction).

Thus, ZnO is the substance that is reduced in this reaction.

Conclusion: The correct answer is (a) ZnO.