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Solution


Q.

Which of the following is used for dissolution of gold
1 Hydrochloric acid  
2 Sulphuric acid  
3 Nitric acid  
4 Aqua regia  

Ans.

(4)

Aqua regia is a mixture of hydrochloric acid and nitric acid in the ratio 3:1 and it can dissolve noble metals such as gold, palladium, and platinum, which however, are not soluble in either of the acids alone.