Zinc reacts with caustic soda to form........

What is caused by an excess of $Na^+$ in the human body?

Assertion $A$: Alkali metals impart characteristic colors to the flame in the flame test.
Reason $R$: They have very low ionization enthalpy.

Sodium carbonate can be manufactured by Solvay's process,but potassium carbonate cannot be prepared by this method because:

Choose the alkali metal with the highest reactivity among the following.

Identify the element having general electronic configuration $ns^1$ from the following.