Question

Aqua regia, which can dissolve gold, is a freshly prepared mixture of concentrated hydrochloric acid and concentrated ______.

Q: Answer-Aqua regia, which can dissolve gold, is a freshly prepared mixture of concentrated hydrochloric acid...

Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 31. It can dissolve gold, even though neither of these acids can do so alone. Aqua regia is a highly corrosive, fuming liquid. It is one of the few reagents that can dissolve gold and platinum.