Aqua regia is a mixture of concentrated nitric acid (HNO$_{3}$) and concentrated hydrochloric acid (HCl). It is known for its ability to dissolve noble metals like gold and platinum. Nitrosyl chloride (NOCl) is formed and contributes to its colour and reactivity. Its pH is highly acidic. The standard ratio is 1 part HNO$_{3}$ to 3 parts HCl by volume or molarity.
Which statement is true about aqua regia? I. Aqua regia is a mixture of HNO$_{3}$ and HCl, in a molar ratio of 3 : 1 II. Nitrosyl chloride and nitrogen dioxide impart yellow/orange colour to aqua regia III. Aqua regia can dissolve gold and platinum IV. pH of aqua regia is $> 7$
Asked in mineral dev officier 2025 · Topic: Inorganic Chemistry (Acid-Base Chemistry and Non-aqueous Solvents)
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