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Which of the following materials, on adding with copper, doesn’t increase its strength?

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in Casting-Forming-Welding II by (119k points)
Which of the following materials, on adding with copper, doesn’t increase its strength?

(a) Cadmium

(b) Silver

(c) Sodium

(d) Aluminium Oxide

The question was asked in a job interview.

I would like to ask this question from Copper Alloys in division Foundry Introduction & Materials of Casting-Forming-Welding II

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The correct option is (c) Sodium

Explanation: Copper originally does not possess a very high amount of strength. For properties of copper to be used, but with more strength, this copper needs to be mixed with certain material, which will provide it the required strength. Cadmium, silver and aluminium oxide are few of those materials which will aid in increasing its strength.

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