Which of the following is used for dissolution of gold? (a) Hydrochloric acid (b) Sulphuric acid (c) Nitric acid Aqua regia

• Solution:

Answer is (d) Aqua regia

Explanation:

Gold is a nobel metal which will not react even with strong acids, hence aqua regia which is a mixture of Nitric and Hydro chloric acid in the ratio 1:3 is used for dissolution of gold.