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

$1 p a r t o f H N O_{3} + 3 p a r t s o f H C l$

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$1 p a r t o f H C l + 3 p a r t s o f H N O_{3}$

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$1 p a r t o f H C l + 1 p a r t o f H N O_{3}$

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$1 p a r t o f H N O_{3} + 2 p a r t s o f H C l$

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Solution

The correct option is A
$1 p a r t o f H N O_{3} + 3 p a r t s o f H C l$

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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