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

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

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.
Bissoy MCQ

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