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Q.

 In which of the following acid solutions gold metal can be dissolved?

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a

Nitric acid

b

Sulfuric acid

c

Hydrochloric acid

d

Aqua-regia

answer is D.

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Detailed Solution

Nitric acid can’t dissolve gold. Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in a ratio 3:1. Aqua regia can dissolve gold and platinum but its constituent acids can’t do so alone. 

 

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