Which acid is used for cleaning gold ornaments?

  1. Nitric acid
  2. Boric acid
  3. Sulphuric acid
  4. Oxalic acid

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  1. The correct answer is Nitric acid.

    Key Points

    • Nitric acid:
      • Nitric acid (HNO3), is a highly corrosive and toxic strong mineral acid that is normally colorless but tends to acquire a yellow cast to the accumulation of oxides of nitrogen if long–stored.
      • Applications:
        • Some precious metals such as gold and platinum do not react with nitric acid  hence it is used for cleaning purpose of these metals.
        • Nitric acid is used in the production of ammonium nitrate for fertilizers, making plastics, and in the manufacture of dyes.
        • Nitric acid is commonly used in science laboratories at schools for experimenting when specifically testing for chloride.
        • Nitric acid has been used in various forms as the oxidizer in liquid–fueled rockets.
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