No.
No.
No, it is not true.
Never.
The product of two rational numbers is always a rational number.
no
Such a sum is always rational.
It the two rational numbers have different signs, then the answer will be negative, otherwise it will be positive.
They are always rational.
Yes.
Yes, it is.
The product of two rational numbers is always a rational number.
No; depends on the signs of the rational numbers.