question_answer

  What is observed when sulphur dioxide is passed through (a) water? (b) lime water? Also write chemical equations for the reactions that takes place.

Answer:

                  (a) When  passed through water, sulphurous acid is formed. The aqueous solution of  turns blue litmus red.      (1/2)        (1/2) (b) But when  passed through lime water, calcium sulphite (white ppt) is formed, which reacts with excess  to form calcium hydrogen sulphite. The chemical equation for the reactions are (1/2)