( I ) The noble metals like gold, platinum dissolve in aqua regia

( II ) 3: 1 ratio of Conc HCl and Conc HNO₃ is called aqua regia

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I and II both are true

I is true and II is false

I is false and II is true

I and II are false

answer is A.

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Detailed Solution

Aqua-regia is a mixture of three parts of concentrated hydrochloric acid and one part of concentrated nitric acid. This mixture is used to dissolve noble metals like gold and platinum.
Au + NO^–₃ + 4H⁺ + 4Cl^–→AuCl₄^– + NO + 2H₂O

3Pt + 4NO₃^– + 16H⁺ + 18Cl^–→3PtCl₆^2– + 4NO + 8H₂O

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