Gold is mixed with copper to:

make gold soft

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make gold hard

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make gold more yellowish

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give gold lustre

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Solution

The correct option is B make gold hard
Pure gold is soft 24k; which is alloyed with base metals for use in jewelry altering its hardness,ductility and melting point.Copper is the most commonly used base metal,giving a red color.Alloys with lower carat rating typically 22k,18k,14k or 10k contain high percentage of copper.

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