####45. Sulphur trioxide can be obtained by which of the following reaction :
[2012]
(a) $CaSO_4+C \xrightarrow{\Delta}$
(b) $Fe_2(SO_4)_3 \xrightarrow{\Delta}$
(c) $S+H_2 SO_4 \xrightarrow{\Delta}$
(d) $H_2 SO_4+PCI_5 \xrightarrow{\Delta}$
(b) $Fe_2(SO_4)_3 \xrightarrow{\Delta} Fe_2 O_3+SO_3$
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