Because Irrational Numbers are defined as those that are not rational. The dichotomy means that every real number belongs to one or the other of these sets, and never to both.
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No. Sqrt(2) is irrational, as is -sqrt(2). Both belong to the irrationals but their sum, 0, is rational.
Sometimes. eg the irrational number √2 squared is 2 which is rational (2 = 2/1) eg the irrational number √(√2) squared is √2 which is irrational.
It is rational
1, 2 are rational and square root of 2 and pi are irrational.
No. sqrt(2)/pi is not rational.