pH
No, pH ranges from 0-10 anything below seven is acidic (closer to zero is more acidic) and anything above seven is a base.
neither pH
Most acidic is substance of pH of 2, then of pH of 5 and the substance of pH 7 is neutral and the substance of pH 11 is basic
No, 7 is neutral. Higher than seven is a base, and lower than 7 is an acid.