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sulphuric acid

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Ashoka Universal School (AUS), Nashik
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Sulphur Dioxide and Sulphuric Acid 1. Sulphur dioxide gas can be prepared by the following chemical methods : (i) By burning sulphur in air. burning S + O2 SO2 (ii) By roasting metallic sulphides in air burning 2PbS + 3O2 2PbO + 2SO2 (iii) By treating metallic sulphites with dil. H2SO4 Na2SO3 + H2SO4 (dil.) Na2SO4 + H2O + SO2 2. In the laboratory, sulphur dioxide is prepared (i) by heating conc. sulphuric acid with copper turnings (ii) by treating dilute sulphuric acid with sodium sulphite. The gas is dried by passing it through conc. sulphuric acid. It is collected by the upward displacement of air. Cu + 2H2SO4 (conc.) CuSO4 + 2H2O + SO2 (g) Na2SO3 + H2SO4 (dil.) Na2SO4 + H2O + SO2 (g) 3. Physical properties of sulphur dioxide gas : 1. It is a colourless gas, having a pungent and suffocating odour, which always causes coughing. 2. It has a sour taste and is fairly soluble in water. 3. It is 2.2 times heavier than air. 4. It is highly poisonous in nature. 4. Chemical properties of sulphur dioxide gas : 1. It is neither combustible nor does it support combustion. 2. It turns moist blue litmus paper red and then bleaches it. Hence, it is acidic as well as a bleaching agent in nature. 3. It dissolves in water to form sulphurous acid. SO2 + H2O H2SO3 1 Key Points

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