Question

Which of the following is used for dissolving gold?

• A. Hydrochloric acid
• B. Sulphuric acid
• C. Nitric acid
• D. Aqua regia

Answer 1

The correct option is D Aqua regia

Aqua Regia is a mixture of nitric acid and hydrochloric acid in the ratio 1:3. It is such a powerful solution that, it can dissolve any substance even gold and platinum.

This is because the nitric acid part of it is an excellent oxidising agent whereas HCl gives ions which can form a coordination complex with gold or silver ions.