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  9. Q9

HPSC HCS 2021 · Question 9 of 177

Which acid is used for cleaning gold ornaments?

Chemistry

  1. ANitric acidCorrect
  2. BBoric acid
  3. CSulphuric acid
  4. DOxalic acid

Answer: A. Nitric acid

Explanation

Dilute nitric acid dissolves base-metal impurities on gold without attacking the gold itself, making it the jeweller's cleaning acid.

Source: HPSC HCS (Ex.Br.) Prelims Paper-I (General Studies) held 12-Sep-2021 (exampyq/doorsteptutor compilation); answers per official HPSC answer key

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