Explanation
Acetic acid (CH3COOH) is a very weak acid compared to H2SO4 . Because sulphuric acid dissociates completely in water and acetic acid partially dissociates in water and the dissociation constant of sulphuric acid is nearly equal to 1 and that of acetic acid is 0.18.
H2S in presence of aqueous acidified solution precipitates as sulphide of Cu and Hg apart from Pb2+ , Bi+3 , Cd+2 , As+3 , Sb+3 and Sn+2.
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