How will you obtain the following from sulphuric acid ? (a) `SO_2` (b) – InterviewSolution

InterviewSolution

1.	How will you obtain the following from sulphuric acid ? (a) `SO_2` (b) `SO_2` (c) `SO_2 Cl_2`.
Answer» (a) `SO_2` is obtained by heating copper with `conc. H_2SO_4`. `Cu + 2H_2 SO_4 rarr Cu SO_4 + SO_2 + 2 H_2 O` It can also be obtained by boiling sulphur with `conc. H_2 SO_4`. `S + 2H_2 SO_4 rarr 3SO_2 + 2H_2 O`. (b) `H_2 SO_4` when titrated with `P_2 O_5` loses water and forms `SO_3`. `H_2 SO_4 + P_2 O_5 rarr 2HPO_3 + SO_3` (c) `SO_2 Cl_2` is formed when `conc. H_2 SO_4` is treated with excess of `PCl_5`. `H_2 SO_4 + 2 PCl_5 rarr SO_2 Cl_2 + 2POCl_3 + 2 HCl`.

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