If addition of conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is made to an unknown salt, a colourle...

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If addition of conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is made to an unknown salt, a colourless and odourless gas is produced then which of the following can be present?
(a) \( \mathrm{CO}_{3}^{2-} \)
(b) \( \mathrm{S}^{2-} \)
(c) \( \mathrm{Cl}^{-} \)
(d) \( \mathrm{NO}_{3}^{-} \)
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