Question : Which of the following liquids can dissolve noble metals such as Gold and Platinum?
Option 1: Formic acid
Option 2: Aqua regia
Option 3: Acetic acid
Option 4: Chloroform
Correct Answer: Aqua regia
Solution : The correct option is Aqua Regia.
Aqua regia , a mixture of concentrated Nitric acid (HNO 3 ) and hydrochloric acid (HCl), can dissolve noble metals like Gold and Platinum. The Nitric acid oxidizes the metal, while the Hydrochloric acid provides chloride ions to form soluble metal chlorides. This powerful solvent is known for its ability to dissolve noble metals, making it useful in various chemical applications and refining processes.
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