A colourless gas with a pungent smell is evolved when dil...
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 K2Cr2O7 solution colourless
acidified KMnO4 solution colourless
Fe(NO3)2 solution green
Pb(NO3)2 paper black
Correct answer is B
If the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colourless.
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