Multiple choice general knowledge

'aqua regia' actually is -

  1. phosphoric acid

  2. nitrohydrochloric acid

  3. hydrochloric acid

  4. dilute sulfuric acid
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B Correct answer
Explanation

Aqua regia is a mixture of concentrated nitric acid and hydrochloric acid in a 1:3 ratio, historically called "nitrohydrochloric acid." It's one of the few substances that can dissolve gold and platinum. The name means "royal water" in Latin. Phosphoric acid, pure hydrochloric acid, and dilute sulfuric acid are different chemical substances.

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