Choose the correct statement :

1. Reciprocal of every rational number is a rational number.
2. The square roots of all positive integers are irrational numbers.
3. The product of a rational and an irrational number is an irrational number.
4. The difference of a rational number and an irrational number is an irrational number.

Every rational number is

1. a natural number
2. an integer
3. a real number
4. a whole number

Decimal representation of a rational number cannot be

1. terminating
2. non-terminating
3. non-terminating repeating
4. non-terminating non-repeating

The product of any two irrational numbers is

1. always an irrational number
2. always a rational number
3. always an integer
4. sometimes rational, sometimes irrational