One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is

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

Which gas is produced when a base reacts with a metal?

$(a)$ State in tabular form the name of the acid and base from which the following salts are formed. Also,mention the nature of the salt,whether it is acidic or basic?
$(i)$ Sodium acetate.
$(ii)$ Ammonium sulphate.

In the following schematic diagram for the preparation of hydrogen gas as shown in the Figure,what would happen if the following changes are made?
$(a)$ In place of zinc granules,the same amount of zinc dust is taken in the test tube.
$(b)$ Instead of dilute sulphuric acid,dilute hydrochloric acid is taken.
$(c)$ In place of zinc,copper turnings are taken.
$(d)$ Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.

In a basic aqueous solution,if the concentration of $[OH^-]$ decreases,what happens to the $pOH$?