Tooth decay is caused by the presence of a base.
True
False
The leftover food in the mouth is eaten by bacteria which releases acid into the mouth. This causes tooth decay.
Question 6 (v) Mark ‘T’ if the statement is true and ‘F’ if it is false: (v) Tooth decay is caused by the presence of a base.
What is tooth decay and how is it caused?
Which acid is the cause of tooth decay?
Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turns red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
(v) Tooth decay is caused by the presence of a base. (T/F)