Which of the following is not a statement?

Which of the following is true?

$\left(\mathrm{i}\right)$ If $p$ is a statement then $~p$ is not a statement.

$\left(\mathrm{ii}\right)$ If $p$ is a statement then $~p$ is also a statement.

$\left(\mathrm{iii}\right)$ Negation of $p: 0$ is a positive number is, $0$ is a negative number.

Negation of the given statement $p$ is

$p$ : There exists a rational number $y$ such that $y^3\ne 108$

In which of the following statements "And" is not used as basic connective?

$p: 63$ is a multiple of $3,7,9$ and $21$

$q:$ Product of $8$and $4$ is even number

$r:$$\mathrm{H}.\mathrm{C}.\mathrm{F}.$of $2$ and $3$ is one