1.

`SO_3` can be obtained byA. `S+H_2SO_4`B. `H_2SO_4 + PCl_5`C. `CaSO_4 +C `D. Heating ferric sulphate

Answer» Correct Answer - D
Only ferric sulphate on heating gives `SO_3`
`Fe_2(SO_4)_3overset(Delta)to Fe_2O_3+3SO_3`
Other reactions do not give `SO_3`
`S+2H_2SO_4 overset(Delta)to3SO_2+2H_2O`
`H_2SO_4+2PCl_5 tounderset("Sulphuryl chloride")(SO_2Cl_2)+2POCl_3+2HCl`
`CaSO_4 + 4C overset(Delta)to CaS+4CO`


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