Choose the typical element.

Which of the following is/are amphoteric oxide$(s)$?

Which of the following has the maximum tendency for hydrate formation?

Show by a chemical reaction with water that $Na_{2}O$ is a basic oxide and $Cl_{2}O_{7}$ is an acidic oxide.

Considering the elements $F,$ $Cl,$ $O,$ and $N,$ the correct order of their chemical reactivity in terms of oxidizing property is:
$(a)$ $F > Cl > O > N$
$(b)$ $F > O > Cl > N$
$(c)$ $Cl > F > O > N$
$(d)$ $O > F > N > Cl$

Which of the following sets of elements have the strongest tendency to form anions?