Question

Which of the following acid is used by goldsmiths for cleaning gold and silver ornaments?

Answer 1

# Since, gold and silver are least reactive metals .

# They didn't react with any acid.

# Except aqua regia (mixture of HCl and nitric acid in molar ratio 3: 1)which can react with it.

# Reacted metals are extracted by goldsmiths later.

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Answer 2

Explanation:

Aqua regia which is mixture of hydrochloric acid and nitric acid for cleaning silver and gold ornaments .