A rational number can be expressed as a ratio in the form, p/q, where p and q are integers and q > 0.
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A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
Yes.
A rational number can be expressed as a ratio of two integers, p/q where q > 0. An irrational number cannot be expressed in such a way.
No, it is always irrational.
Next to any rational number is an irrational number, but next to an irrational number can be either a rational number or an irrational number, but it is infinitely more likely to be an irrational number (as between any two rational numbers are an infinity of irrational numbers).