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

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]}

Option 1 is correct - Aqua regia used by alchemists to separate silver and gold is a mixture of concentrated hydrochloric acid and concentrated nitric acid.

Let`s dissect each option for a better understanding:

Option 2 is incorrect - Aqua regia is not made using sulphuric acid. It is a mixture of hydrochloric acid and nitric acid.

Option 3 is incorrect - Aqua regia does not contain sulphuric acid. It is a mixture of hydrochloric acid and nitric acid.

Option 4 is incorrect - Aqua regia is not made using diluted acids. It requires concentrated hydrochloric acid and concentrated nitric acid to form this mixture.

It is important to note that aqua regia is a highly corrosive and dangerous mixture that can dissolve metals like gold and silver. It is called "royal water" due to its ability to dissolve noble metals, which are otherwise resistant to other acids. Aqua regia`s ability to dissolve gold and silver makes it useful in various chemical procedures and laboratory applications.