By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
Correct answer: B. Cu
- A. Ag
- B. Cu
- C. Zn
- D. Hg
Explanation
Copper strengthens the amalgam matrix and reduces the weak tin-mercury phase, so increasing copper raises strength and hardness. Zinc mainly acts as a deoxidizer and mercury is the liquid reaction component, not the strengthening metal.
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