Question 25
Qualitative AnalysisWhen a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to air. The metal nitrate is therefore
- A.sodium nitrate
- B.mercuric nitrate
- C.lithium nitrate
- D.silver nitrate
- E.potassium nitrate
Show the answer and explanation
Answer: D (silver nitrate)
Explanation
Chloride ions with silver ions give white silver chloride, which darkens (violet, then black) in light as silver is set free.