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In which of the following substances is copper present in its metallic (elemental) form?

1. Schweizer's salt
2. Bordeaux mixture
3. German silver
4. Chalcopyrites

Correct answer: German silver

Solution

German silver (also called nickel silver) is an alloy of copper, nickel, and zinc. Copper is present in metallic elemental form (oxidation state 0). The other options contain Cu in ionic (+1 or +2) form.

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