7.478478…. is a :

1. terminating rational

2. recurring

3. neither rational non-terminating

4. not real

$\dfrac{71}{75}$ is :

1. terminating

2. non-terminating

3. periodic decimal

4. not a rational number

Are the following statements true or false ? Give reasons for your answers ?

(i) Every whole number is a natural number.

(ii) Every whole number is a rational number.

(iii) Every integer is a rational number.

(iv) Every rational number is a whole number.

Arrange $-\dfrac{5}{9}, \dfrac{7}{12}, -\dfrac{2}{3} \text{ and } \dfrac{11}{18}$ in the ascending order of their magnitudes.

Also, find the difference between the largest and the smallest of these rational numbers. Express this difference as a decimal fraction correct to one decimal place.