Sulphur trioxide can be obtained by which of the following reaction...

Sulphur trioxide can be obtained by which of the following reaction? P (a) \( \mathrm{CaSO}_{4}+\mathrm{C} \stackrel{\Delta}{\longrightarrow} \) (b) \( \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \stackrel{\Delta}{\longrightarrow} \) (2012 Pre) W) (c) \( \mathrm{S}+\mathrm{H}_{2} \mathrm{SO}_{4} \stackrel{\Delta}{\longrightarrow} \) (d) \( \mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{PCl}_{5} \stackrel{\Delta}{\longrightarrow} \) 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live