The correct answer is 'II' is more basic than 'I'.Concept:Acid:It is sour in taste.It turns the blue litmus color into red.It has a pH value of less than 7. It is represented by a value less than 7 on the pH scale.Base:It is bitter in taste and slippery to touch.It turns the red litmus color into the blue.It is represented by a value greater than 7 on the pH scale.Explanation:pH scale:A scale developed to measure the concentration of hydrogen ions in a solution is known as the pH scale where p in pH implies potenz in German.pH scale ranges from 0 (highly acidic) to 14 (highly alkaline).The pH of a neutral solution is 7.The basic strength increases as we move from 7 to 14 on the pH scale.Thus, 'II' (pH = 9) is more basic than 'I' (pH = 8.2).