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    Question

    Which of the following acid proves to be useful for the

    purification of gold and silver? 
    A Sulphuric acid Correct Answer Incorrect Answer
    B Hydrochloric acid Correct Answer Incorrect Answer
    C Carboxylic acid Correct Answer Incorrect Answer
    D Nitric acid Correct Answer Incorrect Answer

    Solution

    Nitric acid is used for purification of various precious metals, including gold, silver, and platinum. In metallurgy, it is used in combination with alcohol for etching designs on metals like brass, copper, bronze, etc.

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