Calcium phosphate is present in tooth enamel. Its nature is

The acid found in vinegar is

The reaction between an acid and a base is known as _______________ reaction.

Which of the following is used tor dissolution of gold?

The solutions which do not change the colour of either red or blue litmus are known as

A solution turns red litmus blue, its pH is likely to be

An aqueous solution turns red litmus solution blue. Excess addition of which of  the following solution would reverse the change.

____________ is known as baking soda.

Which of the following is acidic in nature?

_________is a natural indicator which is extracted from lichens.