Question

Select the option Which completes the sentence correctly-I have to go to the docter_ I will not be coming to school on monday

Answer 1

An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. ... Simply put, olfactory indicators are substances which have a different odour in acid and base solutions. For eg: Vanilla extract has a characteristic pleasant smell, onion and clove oil, etc.