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
If the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colourless.
The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is Na\(_2\)SO\(_3\)
Na\(_2\)SO\(_3\)(s) + HCl(aq) → NaCl(aq) + H\(_2\)O(l) + SO\(_2\)(g)
When SO\(_2\) gas which is colourless with a pungent smell, reacts with acidified KMnO\(_4\), it becomes decolorized from purple colour.
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