Which one of the following acid is used by goldsmith for cleaning of gold and silver articles ?
- A. Sulphuric acid
- B. Nitric acid ✓
- C. Hydrochloric acid
- D. Phosphoric acid
Correct Answer: B. Nitric acid
Explanation
Nitric acid is often used by goldsmiths to clean gold and silver articles because it removes impurities (like copper) without dissolving the precious metals themselves.
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