Mention the range of $pH$ value for identification of a base.

Tooth enamel is the hardest substance in our body. Name the compound of which it is made up. At what $pH$ of the mouth does it get corroded? State the role of bacteria present in the mouth. Suggest a method to prevent tooth decay.

Which of the following is not a strong acid?

What is the number of moles of solute dissolved in $1 \ L$ of solution called?

To protect against tooth decay,we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Which of the following substances is an antacid?