If the pH value of a substance is below seven then it is ______ in nature.
acidic
basic
neutral
alkaline
Fill in the following blanks with suitable words :
(a) Acids have a pH ___ than 7.
(b) Alkalis have a pH ___ than 7.
(c) Neutral substances have a pH of __
(d) The more acidic a solution, the ___ the pH.
(e) The more alkaline a solution, the ___ the pH.