Which of the following elements has the smallest energy gap?

Given below are two statements.
Statement $I$ : $O_2, Cu^{2+}$ and $Fe^{3+}$ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field.
Statement $II$ : $NaCl$ and $H_2O$ are weakly magnetized in opposite direction to magnetic field.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which of the following is the composition of glass?

Some substances are given below:
$Ag$; $CO_{2(s)}$; $SiO_2$; $ZnS$;
$SO_{2(s)}$; $AlN$; $HCl_{(s)}$; $H_2O_{(s)}$
The number of molecular solids and network solids in the above list is respectively

Which of the following compounds is metallic and ferromagnetic?

Which of the following is a molecular crystal?