Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the proper composition of Aqua-regia from the given options?

$1 H N O_{3} + 3 H C l$

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$1 H C l + 3 H N O_{3}$

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$1 H C l + 1 H N O_{3}$

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$1 H N O_{3} + 2 H C l$

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Solution

The correct option is A
$1 H N O_{3} + 3 H C l$

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid $(H N O_{3})$ at a ratio of 3:1, i.e. the volume of a solution with 3 parts hydrochloric acid (HCl) added to 1 part of Nitric acid $(H N O_{3})$ .

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It is said that aqua regia can dissolve or corrode highly unreactive

Metals like gold and platinum.

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