The smallest rational number is

Which of the following is/are not rational number.

$\frac{-1}{2}, \frac{0}{1}, -7, \frac{1}{-7}, 0, \frac{2}{0}, \frac{5}{-6}, \frac{10}{0}$

Which of the following are positive rational numbers or negative rational numbers?

$\frac{3}{4}$

Which of the following are positive rational numbers or negative rational numbers?

$\frac{-2}{5}$

Which of the following are positive rational numbers or negative rational numbers?

$\frac{-1}{3}$

Which of the following are positive rational numbers or negative rational numbers?

$\frac{8}{-6}$

Which of the following are positive rational numbers or negative rational numbers?

$\frac{-3}{-6}$