alleryAqua regia is prepared by mixing concentrated hydrochloric acid and concentrated nitric acid in which ratio?
A3 : 1
B1 : 3
C1 : 1
D2 : 3
Answer & Solution
Correct answer: A. 3 : 1
1. Aqua regia can dissolve noble metals like gold and platinum.
2. It is freshly prepared by mixing concentrated HCl and concentrated HNO3.
3. The mixing ratio of HCl to HNO3 is 3 : 1.
4. The reversed ratio 1 : 3 would give the wrong composition.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.105_
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