An open tank filled with a liquid has a small hole near its bottom....

According to Torricelli's law, the velocity of efflux $v$ of a liquid from a small hole at a depth $h$ below the free surface of the liquid in an open tank is given by $v = \sqrt{2gh}$.

From this expression, it is clear that the speed of the ejected liquid depends on the height of the liquid from the hole ($h$) and the acceleration due to gravity ($g$).

The expression does not contain any term for the density of the liquid or the area of the hole (since the hole is considered small, the velocity of the free surface is negligible).

Therefore, the speed of the ejected liquid does not depend on the density of the liquid and the area of the hole.