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The composition of aqua-regia is- dil.HCl:conc. HNO3 3: 1
- conc.HCl:dil. HNO3 3 : 1
- conc.HCl:conc.HNO3 3 : 1
- dil.HCl:dil.HNO3 3: 1
Correct answer: (c) conc.HCl:conc.HNO3 3 : 1
Explanation: Aqua-regia is a freshly prepared mixture of one part of concentrated nitric acid and three parts of concentrated hydrochloric acid (ratio 1:3).
[Note: Gold and platinum are special metals that are insoluble in common reagents but soluble in aqua-regia.]
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