What is the oxidation number of copper in brass?

What is the oxidation state of $\mathrm{I}$ in ${\mathrm{INO}}_3$?

${\mathrm{CrBr}}_3\to {\mathrm{CrO}}_4^{2-}+{\mathrm{BrO}}_{{}_4}^{-}$

The total number of electron changes in the above given reaction are

Choose the correct statement for rusting of iron.

a. $\mathrm{Fe}$ is oxidised.

b. ${\mathrm{O}}_2$ is reduced.

c. $\mathrm{Fe}$ is an oxidising agent.

d. It is an intramolecular redox reaction.

a. ${\mathrm{NaNO}}_2$  b. ${\mathrm{NaNO}}_3$  c.  $\mathrm{HI}$   d.  ${\mathrm{SO}}_2$   e. ${\mathrm{O}}_2$   f.  ${\mathrm{KMnO}}_4$

Which of the following statement is not true about the given compounds?