Aqua regia used by alchemists to separate silver and gold is a mixture of

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Q: 66 (CDS-I/2009)
Aqua regia used by alchemists to separate silver and gold is a mixture of
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,33,28,33,10,12,6

keywords: 

{'aqua regia': [0, 0, 1, 0], 'silver': [0, 0, 0, 1], 'sulphuric acid': [1, 1, 0, 1], 'mixture': [0, 0, 1, 5], 'alchemists': [0, 0, 1, 0], 'hydrochloric acid': [1, 0, 3, 0], 'nitric acid': [0, 0, 0, 2], 'gold': [8, 1, 7, 14], 'concentrated': [0, 0, 1, 0]}