What is the composition of aqua-regia that corrodes noble metals such – McqOptions

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1.	What is the composition of aqua-regia that corrodes noble metals such as platinum, gold?
A.	3 parts of nitric acid and 1 part of hydrochloric acid
B.	3 parts of hydrochloric acid and 1 part of nitric acid
C.	1 part of hydrofluoric acid and 3 part of hydrochloric acid
D.	3 parts of hydrofluoric acid and 1 part of hydrochloric acid
Answer» C. 1 part of hydrofluoric acid and 3 part of hydrochloric acid

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