Multiple choice general knowledge math & puzzles

Aqua Regia is ___ .

  1. highly concenterated mixture of nitric acid and sulphuric acid

  2. highly concenterated mixture of hydrochloric acid and nitric acid

  3. highly concenterated mixture of hydrochloric acid and sulphuric acid

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Aqua Regia is a highly corrosive mixture of concentrated hydrochloric acid (HCl) and nitric acid (HNO3) in a 3:1 ratio by volume. It is one of the few substances that can dissolve gold and platinum, making it invaluable in gold refining and analytical chemistry. The nitric acid acts as an oxidizer while hydrochloric acid provides chloride ions to form soluble chloroaurate complexes.

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