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# $S{O_3}$ can act as(A) Oxidising agent(B) Reducing agent(C) Both a and b(D) None

Last updated date: 20th Mar 2023
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Sulphur trioxide is a chemical compound and it is represented by the chemical formula $S{O_3}$ . It exists in a number of modifications that differ in molecular species and in crystalline form. It is colourless in its liquid form. It is a highly reactive substance and also a strong oxidising agent. It also acts as a fire hazard. It is a thermodynamically unstable compound with respect to the compound selenium dioxide. In $S{O_3}$ sulphur is in $+ 6$ oxidation state which is its highest oxidation state. So, it cannot be oxidized further. Hence, it acts as a strong oxidizing agent and because of this $S{O_3}$ itself gets reduced and oxidised other compounds. $S{O_3}$ is not used as a reducing agent as it cannot donate a lone pair of electrons. The bleaching action of sulphur is based on the oxidation.
$S{O_3}$ is used as a bleaching agent to remove the residual hydrogen peroxide or as a digesting agent to separate the pulp from lignin. It is also used as a catalyst in the oxidation reaction of sulphur dioxide to sulphur trioxide. It is used in the manufacture of photoelectric cells and also solar energy devices.