Choose the correct statement(s) regarding the following reaction: Cr_2O_7^ 2- (aq) +3…

CHEMISTRY · Multi-part · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

Choose the correct statement(s) regarding the following reaction:

\mathrm{Cr_2O_7^{2-}(aq)}+3\mathrm{SO_3^{2-}(aq)}+8\mathrm{H^+}\longrightarrow2\mathrm{Cr^{3+}(aq)}+3\mathrm{SO_4^{2-}(aq)}+4\mathrm{H_2O}

(a)

\mathrm{Cr_2O_7^{2-}}

is the oxidising agent. (b)

\mathrm{SO_3^{2-}}

is the reducing agent. (c) The oxidation number of each S atom in

3\mathrm{SO_3^{2-}}

is increased by two. (d) The oxidation number of each Cr atom in

\mathrm{Cr_2O_7^{2-}(aq)}

is decreased by three.