Tooth paste contain a/an………to prevent tooth decay from acid produced by bacteria?
a) acid
b) alkali
c) salt
d) water
pH Scale And Its Range With Reference To Indicator:
pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
All the aqueous solutions are…….
a) acidic
b) alkaline
c) neutral
d)all of these
pH scale runs from zero to …….
a) 3
b) 7
c)14
d) 20
A numerical value that indicates the strength of an acidic or alkaline solution is called……
a) time scale
b) pH scale
c) acidic scale
d) alkaline scale
What is the pH of the acidic solution?
a) 7
b) less than 7
c) more than 7
d) greater than 14
