Which acid is used to extract gold?
A.
Citric acidB.
Nitric acidC.
Hydrochloric acidD.
Tartaric acidAnswer & Solution
Answer:
Hydrochloric acid
Solution:
Hydrochloric acid is used in combination with nitric acid to
form a mixture called aqua regia.
Aqua regia is a highly corrosive and effective mixture used to dissolve gold
and platinum, which are resistant to single acids. The nitric acid acts as an
oxidizing agent, while the hydrochloric acid provides chloride ions that form
soluble complexes with gold, enabling its extraction.
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