6.
Mark T if the statement is true and 'F' if it is false;
(1) Nitric acid turn red litmus blue. (T/F)
(11) Sodium hydroxide turns blue litmus red. (T/F)
(11) 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)​