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Aqua regia, which is used for dissolving...

Aqua regia, which is used for dissolving noble metals like gold and platinum etc. Is:

A

Equal volumes of conc.HCl : conc. `HNO_(3)` acid

B

1 part of HCI and 3 parts of `HNO_(3)`acid

C

3 part of cone. HCI and 1 part of cone . `HNO^(3)` acid

D

Equal volume of cone. `HNO_(3)` cone. HCI and water

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