A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added...
CHEMISTRY
WAEC 2022
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
- A. acidified K2Cr2O7 solution colourless
- B. acidified KMnO4 solution colourless
- C. Fe(NO3)2 solution green
- D. Pb(NO3)2 paper black
Correct Answer: B. acidified KMnO4 solution colourless
Explanation
If the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colourless.
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