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Reaction of Acids with Metals

What is aqua ...

Question

What is aqua regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.

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Solution

Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1.

Gold and silver are insoluble in common reagents but dissolve in aqua-regia.

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Q. Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Which of the following represents the correct composition of Aqua-regia?

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