Which of the following does not decompose on heating?

Which of the alkali metal chloride $(MCl)$ forms its dihydrate salt $(MCl.2H_2O)$ easily?

In which of the following is potassium stored?

Assertion $(A): K, Rb$ and $Cs$ form superoxides. \\ Reason $(R):$ The stability of superoxides increases from $K$ to $Cs$ due to decrease in lattice energy.

Identify the products $A, B, C, D$ in the reactions given below:
$(X) \ NaCl \xrightarrow{\text{Aq. Electrolysis}} A + B(g) + Cl_2$
$A + Al \rightarrow NaAlO_2 + B(g)$
$(Y) \ A + Cl_2 \rightarrow C + D + H_2O$

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