question_answer 10)

State whether the following statements are true or false and correct the false statements. (a) Nitric acid turns red litmus to blue. (b) Sodium hydroxide turns blue litmus to red. (c) Sodium hydroxide and hydrochloric acid neutralizes each other and form salt and water. (d) Indicator is a substance which shows different colours in acidic and basic solutions. (e) Tooth decay is caused by the presence of a base.  

Answer:

(a) False, nitric acid turns blue litmus to red because it is an acid. (b) False, sodium hydroxide is a base, so it will turn red litmus to blue. (c) True (d) True (e) False, tooth decay is caused by the presence of acid.