Sulphur trioxide can be obtained by which of the following reaction :
(a) ![CaSO_4 + C \xrightarrow[]{\Delta}](https://tex.z-dn.net/?f=CaSO_4+%2B+C+%5Cxrightarrow%5B%5D%7B%5CDelta%7D "CaSO_4 + C \xrightarrow[]{\Delta}")
(b) ![Fe_2(SO_4)_3 \xrightarrow[]{\Delta}](https://tex.z-dn.net/?f=Fe_2%28SO_4%29_3+%5Cxrightarrow%5B%5D%7B%5CDelta%7D "Fe_2(SO_4)_3 \xrightarrow[]{\Delta}")
(c) ![S + H_2SO_4 \xrightarrow[]{\Delta}](https://tex.z-dn.net/?f=S+%2B+H_2SO_4+%5Cxrightarrow%5B%5D%7B%5CDelta%7D "S + H_2SO_4 \xrightarrow[]{\Delta}")
(d) ![H_2SO_4 + PCl_5 \xrightarrow[]{\Delta}](https://tex.z-dn.net/?f=H_2SO_4+%2B+PCl_5+%5Cxrightarrow%5B%5D%7B%5CDelta%7D "H_2SO_4 + PCl_5 \xrightarrow[]{\Delta}")
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ALWAYS......
D IS RIGHT ANSWER........
D IS RIGHT ANSWER........
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