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When H(2)S is passed through an acidifie...

When `H_(2)S` is passed through an acidified solution of an inorganic mixture ( which contains no group-II cation), yellowish turbidity appears. Explain.

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The mixture must contain some nitrite or nitrate salt,which releases either nitrous or nitric acid in acidic medium. These acids oxidise `H_(2)S` to S, which causes yellowish turbidity.
`2HNO_(2)+H_(2)Sto2NO+2H_(2)O+S` (yellowish turbidity)
`2HNO_(3)+H_(2)Sto2NO_(2)+2H_(2)O+S` (yellowish turbidity)
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