Alkali metals dissolve in liquid ammonia to give a deep blue solution. This blue color is due to which of the following?

Give uses of sodium carbonate $(Na_2CO_3 \cdot 10H_2O)$.

In the presence of air,washing soda loses $9$ molecules of water to form a monohydrate: $Na_2CO_3 \cdot 10H_2O \xrightarrow{\text{In open air}} Na_2CO_3 \cdot H_2O + 9H_2O$. This process is known as:

Write the chemical reactions for the formation of oxides,peroxides,and superoxides of alkali metals.

The correct statement$(s)$ among $I$ to $III$ with respect to potassium ions that are abundant within the cell fluids is/are :
$I.$ They activate many enzymes
$II.$ They participate in the oxidation of glucose to produce $ATP$
$III.$ Along with sodium ions,they are responsible for the transmission of nerve signals

Choose the false statement regarding the properties of sodium hydroxide $(NaOH)$.