Which of the following statements about the reaction is (are) incorrect?
${\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{I}}_2\left(\mathrm{s}\right)\to 2\mathrm{HI}\left(\mathrm{aq}\right)+\mathrm{S}\left(\mathrm{s}\right)$
a) Iodine acts as an oxidizing agent.
b) Iodine is oxidized to hydrogen iodide.
c) Hydrogen sulphide acts as an oxidizing agent.
d) Hydrogen sulphide is being oxidized to sulphur.

In the given reaction:

${\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)+{\mathrm{I}}_2\left(\mathrm{s}\right)\to 2\mathrm{HI}\left(\mathrm{aq}\right)+\mathrm{S}\left(\mathrm{s}\right)$
${\mathrm{H}}_2\mathrm{S}$ is changing into S. This is the removal of hydrogen from ${\mathrm{H}}_2\mathrm{S}$. By this definition, the removal of hydrogen is known as oxidation. Therefore, hydrogen sulphide is oxidized to sulphur. Here, hydrogen sulphide acts as a reducing agent.
${\mathrm{I}}_2$ is changing into HI. This is the addition of hydrogen to iodine. By this definition, the addition of hydrogen is known as reduction. Therefore, iodine is reduced to hydrogen iodide. Here, iodine acts as an oxidizing agent.

So statements b and c are incorrect.