A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn
- acidified K\(_{2}\)Cr\(_{2}\)O\(_{7}\) solution colourless
-
acidified KMnO\(_{4}\) solution colourless
- Fe(NO\(_{3}\))\(_{2}\) solution green
- Pb(NO\(_{3}\))\(_{2}\) paper black
The correct answer is: B
Explanation
If the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colourless.