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The freshly prepared mixture of concentrated HCl and concentrated HNO₃ in a 3:1 ratio, able to dissolve gold, is called
Aaqua regia
Bmilk of lime
Cbrine solution
Damalgam
Answer & Solution
Correct answer: A. aqua regia
1. Neither concentrated HCl nor concentrated HNO₃ alone can dissolve gold.
2. Their 3:1 mixture, **aqua regia** ('royal water'), is highly corrosive and can dissolve gold and platinum.
3. An amalgam is an alloy with mercury; brine is salt solution.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.2.3 (Do You Know)_
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