Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

Products of a neutralisation reaction are always

Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed

When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

‘Litmus’, a natural dye is an extract of which of the following?