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Copper metal is used in making:

1. electric wires
2. fuse wires
3. filling cavity in teeth
4. preparation of hydrogen

Correct answer: electric wires

Solution

Copper is an excellent conductor of electricity and can be drawn into thin, flexible wires, so it is widely used for electric wiring. Fuse wires need a low melting point, dental fillings use different alloys, and copper is not used to prepare hydrogen.

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