Question

Aqua regia releases nascent………….

Answer 1

Hint: Aqua regia is a mixture of concentrated nitric acid and hydrochloric acid, usually in the ratio of $1:3$ by volume. It is a red or yellowish coloured liquid. Aqua regia is extremely corrosive and can cause skin burns.

Complete answer:
This mixture of nitric acid and hydrochloric acid called Aqua regia can dissolve many metals that are normally very challenging to dissolve, such as noble metals. So the solution that can dissolve them is given the name Royal water.
 Nitric acid and hydrochloric acid react to produce soluble nitrosyl chloride, water and nascent chlorine.
$HN{O_3} + 3HCl \to NOCl + 2{H_2}O + 2Cl$
Aqua regia is mainly used to dissolve various noble metals such as gold and platinum that are anyways not soluble in other types of acids. The high reactivity of Aqua regia was found which is due to the formation of nascent chlorine.
The nascent chlorine is highly reactive as it has an unpaired electron in a high energy orbital and it is able to react with the gold (III) ions to form soluble tetrachloroaurate (III) complex.
Thus, we can say that the mixture produces nascent chlorine which reacts with noble metals in order to dissolve them. The product of the mixture is more powerful than the sum of its parts.

Note:
As we have seen Aqua regia is useful in dissolving noble metals and finds application in the extraction and purification of these metals. Aqua regia should be handled with care, it is extremely corrosive. Aqua regia should be prepared before use only and should not be stored, this is because it loses its effectiveness due to oxidation.