Which of the following salts is formed by the neutralization of a weak acid and a strong base?

What happens to the $pH$ of a basic aqueous solution if the concentration of $[OH^-]$ ions increases?

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

Write true or false for the following statement:
On the $pH$ scale,we can measure $pH$ from $0$ (very acidic) to $14$ (very alkaline).

Calcium phosphate is present in tooth enamel. Its nature is

When soap is scrubbed on a stain of curry on a white cloth,why does it become reddish-brown,and why does it turn yellow again when the cloth is washed with plenty of water?