Discussion
Read the following statements and choose the correct option.
Process A - Galvanization to prevent rusting.
Process B - Electroplating of copper.
Answer: C
The key reads galvanization as a physical change and electroplating as a chemical change.
In electroplating, an electric current passed through a solution of a copper salt drives a chemical reaction: copper ions gain electrons at the object and are deposited as copper metal while copper dissolves at the other electrode. New substances form at the electrodes, so it is a chemical change.
Galvanization is treated as a protective coating: iron is covered with a layer of zinc, for example by dipping it in molten zinc, so that air and moisture cannot reach the iron. On this school-level reading no new substance is made in the iron; it is simply coated, which is why the key calls it physical. The options calling both changes the same kind, or reversing them, disagree with this reading.
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