A) Forms' acid-rain
B) Is a reducing agent
C) Is soluble in water
D) Is used as a food-preservative
Correct Answer: D
Solution :
(a) Nitrogen dioxide and sulphur dioxide forms acid rain. 'Acid rain' is the rain water containing sulphuric acid and nitric acid. \[HN{{O}_{2}}\text{ }+\text{ }2{{H}_{2}}\text{O }+{{O}_{2}}\xrightarrow{\,}4HN{{O}_{3}}\] \[~2S{{O}_{2}}\text{ }+\text{ }2{{H}_{2}}\text{O }+\text{ }{{\text{O}}_{2}}\text{ }\xrightarrow{\,}\text{ }2{{H}_{2}}S{{O}_{4}}\] (b) \[N{{O}_{2}}\] and \[S{{O}_{2}}\] act as a good reducing agent e.g. \[S{{O}_{2}}\] reduces halogens to halogen acid \[C{{l}_{2}}+2{{H}_{2}}O+S{{O}_{2}}\to 2HCl+{{H}_{2}}S{{O}_{4}}\] (c)\[N{{O}_{2}}\] and \[S{{O}_{2}}\] both are soluble in water. (d) \[S{{O}_{2}}\] is used in the manufacture of sodium bisulphite (\[NaHS{{O}_{3}}\]) which is used as a preservative for jams, jellies and squashes.
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