Consider the elements :
$\mathrm{C}\mathrm{s}, \mathrm{N}\mathrm{e}, \mathrm{I}$ and $\mathrm{F}$

Identify the element that exhibits only negative oxidation state, identify the element that exhibits only positive oxidation state, identify the element that exhibits both positive and negative oxidation states and identify the element which exhibits neither the negative nor does the positive oxidation state.

Refer to the periodic table given in your book and now answer the following question:

Select the possible non-metals that can show disproportionation reaction.

Refer to the periodic table given in your book and now answer the following question:

Select three metals that can show disproportionation reaction.

Arrange the following metals in the order in which they displace each other from the solution of their salts.

$\mathrm{Al}, \mathrm{Cu}, \mathrm{Fe}, \mathrm{Mg}$ and $\mathrm{Zn}$.