Question

what is aqua-regia solution?

Answer 1

hello, 
aqua-regia,it is a mixture of HCl and HNO₃ in the ratio of 3:1
it is called king's water and royal water
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Answer 2

Aquaregia is a mixture of concentrated HCl and concentrated nitric acid in the volumetric ratio 3:1.
It is can dissolve noble metals like gold, silver, platinum.
The reactivity of Aquaregia is due to the formation of nescent chlorine (atomic chlorine).