A salt gives a vinegar-like smell on warming with dilute H2SO4 and a deep red colour with neutral FeCl3 solution. The anion is

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A salt gives a vinegar-like smell on warming with dilute $H X_{2} SO X_{4}$ and a deep red colour with neutral $FeCl X_{3}$ solution. The anion is

Acetate is displaced as acetic acid, which has the vinegar smell, and neutral

FeCl X_{3}

gives red iron(III) acetate complex. Oxalate gives no smell with dilute acid, nitrite gives brown fumes and thiosulphate gives

SO X_{2}

and sulphur.