Between any two given rational numbers we can find

1. one and only one rational number

2. only two rational numbers

3. only ten rational numbers

4. infinitely many rational numbers

A rational number between $\dfrac{1}{5} \text{ and } \dfrac{1}{2}$ is

1. $\dfrac{1}{10}$

2. $\dfrac{1}{20}$

3. $\dfrac{7}{10}$

4. $\dfrac{7}{20}$

The arrangement of rational numbers $\dfrac{-7}{10}, \dfrac{5}{-8}, \dfrac{2}{-3}$, in ascending order is

1. $\dfrac{2}{-3}, \dfrac{5}{-8}, \dfrac{-7}{10}$

2. $\dfrac{-7}{10}, \dfrac{2}{-3}, \dfrac{5}{-8}$

3. $\dfrac{5}{-8}, \dfrac{-7}{10}, \dfrac{2}{-3}$

4. $\dfrac{-7}{10}, \dfrac{5}{-8}, \dfrac{2}{-3}$

Fill in the blanks:

(i) $-\dfrac{7}{8} + \dfrac{2}{11} = \dfrac{2}{11} + \left(-\dfrac{7}{8}\right)$ depicts ……… property of addition of rational numbers.

(ii) The multiplicative inverse of a rational number is also called its ………

(iii) The multiplicative inverse of a negative rational number is a ……… rational number.

(iv) The numbers ……… and ……… are their own reciprocals.

(v) $\left(-\dfrac{10}{11}\right) \div$ ……… = 1

(vi) $\left(-\dfrac{7}{9}\right) \times$ ……… = 1

(vii) Among $-\dfrac{5}{11}, \dfrac{-5}{13} \text{ and } \dfrac{-5}{7}$ the greatest rational number is ………