How many anions will give colourless acid vapour/ gas with conc

CHEMISTRY · Subjective · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

How many anions will give colourless acid vapour/ gas with conc. H2SO4\text{H}_2\text{SO}_4 on reaction with following given anions ? CH3COO−\text{CH}_3\text{COO}^- , Cl−\text{Cl}^- , Br−\text{Br}^- , S2−\text{S}^{2-} , SO32−\text{SO}_3^{2-} , BO33−\text{BO}_3^{3-} , NO2−\text{NO}_2^- , C2O42−\text{C}_2\text{O}_4^{2-} , I−\text{I}^-

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