Q.

Aquaregia is a mixture of the following in the ratio 1 : 3 by volume–

A. cone. HNO3 and cone. HCL
B. conc. HNO3 and conc. H2SO4
C. dil. HCl and dil. HNO3
D. cone. HCl and cone. HNO3
Answer» C. dil. HCl and dil. HNO3
Explanation: Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold.
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