• # question_answer $S{{O}_{2}}$ is obtained when [Roorkee 1995] A) Oxygen reacts with dilute sulphuric acid B) Hydrolysis of dilute ${{H}_{2}}S{{O}_{4}}$ C) Concentrated ${{H}_{2}}S{{O}_{4}}$ reacts with $N{{a}_{2}}S{{O}_{3}}$ D) All of these

$\underset{(S)}{\mathop{N{{a}_{2}}S{{O}_{3}}}}\,+\underset{(aq)}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,\,\to \,\underset{(aq)}{\mathop{N{{a}_{2}}S{{O}_{4}}}}\,+\underset{(l)}{\mathop{{{H}_{2}}O}}\,+\underset{(g)}{\mathop{S{{O}_{2}}}}\,$