a) 0
b) 7
c) 14
d) 1
For Explanation Click Here:
The pH scale ranges from 0 to 14, with 7 being considered neutral. A neutral solution is one where the concentration of hydrogen ions (H⁺) equals the concentration of hydroxide ions (OH⁻), which occurs in pure water at 25°C. A pH below 7 is acidic, and a pH above 7 is basic.