Discolouration of silver alloy is due to_____________?
Correct answer: D. Tarnish and corrosion
- A. Tarnish
- B. Dry corrosion
- C. Wet corrosion
- D. Tarnish and corrosion
Explanation
Silver-alloy discoloration results from both tarnish, which is surface chemical discoloration, and corrosion, which involves material degradation. Therefore, the combined option is more complete than tarnish alone.
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