$NH_{4}Cl$ is a salt of which type?

Calcium phosphate is present in tooth enamel. Its nature is

Write the chemical equations for the reactions of zinc granules with:
$(a)$ Sulphuric acid
$(b)$ Hydrochloric acid
$(c)$ Aluminium chloride
$(d)$ Sodium hydroxide
$(e)$ Nitric acid

$(i)$ What is meant by the term hydrated salt?
$(ii)$ Give two examples of hydrated salts that are white in color and state their chemical formulas.

Which of the following is a weak acid?

The colour of $pH$ paper strip at the $pH$ values of $1, 7,$ and $14$ will be: