Question

what is aqua regia...?​

Answer 1

Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals. 

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Answer 2

In short --aqua regia has the capacity to dissolve the noble elements.

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