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What will happen to the elastic property of Gold when Potassium is added to gold?

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What will happen to the elastic property of Gold when Potassium is added to gold?

(a) The elastic property of gold decreases

(b) The elastic property of gold remains unaltered

(c) The elastic property of gold increases

(d) Gold loses its elastic property

This question was addressed to me in examination.

My query is from Elasticity topic in section Thermal Properties of Matter of Engineering Physics I

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Right option is (c) The elastic property of gold increases

Easiest explanation: The addition of impurities causes variation in the elastic property of materials. Potassium when added to gold increases its elasticity thereby making it easy to be electroplated.

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