Correct Answer: Option C

Explanation

When sulphur dioxide (SO₂) reacts with a solution of sodium hydroxide (NaOH), it forms sodium sulphite (Na₂SO₃) and water (H₂O). The balanced chemical equation for this reaction is: SO\(_2\)(g) + 2NaOH(aq) → Na\(_2\)SO\(_3\)(aq) + H\(_2\)O(l). 

When the gas is passed for a long time, the solution becomes saturated with SO\(_2\)(excess). The initially formed sodium sulfite reacts further with the excess SO2 and water to produce sodium hydrogen sulphite, NaHSO\(_3\)(Sodium bisulphite)

                                                  Na\(_2\)SO\(_3\) + H\(_2\)O + SO\(_2\) →   2NaHSO\(_3\)

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