Which anion does not liberate any gas with dilute as well as conc. `H_(2)SO_(4)`.

Which anion does not liberate any gas with dilute as well as conc. `H_(2)SO_(4)`.
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Which anion does not liberate any gas with dilute as well as conc. `H_(2)SO_(4)`. A. `NO_(2)^(-)` B. `NO_(3)^(-)` C. `SO_(3)^(2-)` D. `SO_(4)^(2-)`
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