← All previous year questions
HCS (Haryana)Prelims2021General Studies
Question
Which acid is used for cleaning gold ornaments?
Options
- A Nitric Acid
- B Boric acid
- C Sulphuric Acid
- D Oxalic Acid
Show AnswerHide Answer
Correct Answer
A Nitric Acid
Model Answer
Nitric acid
- Nitric acid (HNO3), is a highly corrosive and toxic strong mineral acid that is normally colourless but tends to acquire a yellow cast to the accumulation of oxides of nitrogen if long–stored.
- Some precious metals such as gold and platinum do not react with nitric acid hence it is used for cleaning purpose of these metals.
- Nitric acid is used in the production of ammonium nitrate for fertilizers, making plastics, and in the manufacture of dyes.