The composition of aqua-regia is :

D i l . H C l : C o n c . H N O_{3}

3 : 1

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C o n c . H C l : D i l . H N O_{3}

3 : 1

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C o n c . H C l : C o n c . H N O_{3}

3 : 1

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D i l . H C l : D i l . H N O_{3}

3 : 1

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Solution

The correct option is D $C o n c . H C l : C o n c . H N O_{3}$ = $3 : 1$
Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, optimally in a volume ratio of 1:3. Aqua regia is highly corrosive that it can dissolve metals, such as gold and platinum.

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