The solubility of $Na_2SO_4$,$BeSO_4$,$MgSO_4$ and $BaSO_4$ in water follows the order:

Which hydride is most stable?

The ionic mobility of alkali metal ions in aqueous solution is maximum for

Statement $I$: An alloy of lithium and magnesium is used to make aircraft plates.
Statement $II$: The magnesium ions are important for cell-membrane integrity.
In the light of the above statements,choose the correct answer from the options given below.

Salt $A + S \to B \xrightarrow{BaCl_2}$ White precipitate.
$A$ is paramagnetic in nature and contains about $55\% \, K$. Thus,$A$ is

Starting with sodium chloride,how would you proceed to prepare:
$(i)$ sodium metal
$(ii)$ sodium hydroxide
$(iii)$ sodium peroxide
$(iv)$ sodium carbonate?