Which of the following statements are correct regarding lithium and magnesium?

I. They react slowly with water.

II. Their bicarbonates are solids.

III. Their chlorides are not soluble in ethanol.

IV. Their nitrates decompose easily on heating.

The correct option is

Which of the following orders are correct against the stated property?

I. $\mathrm{NaO}_2<\mathrm{KO}_2<\mathrm{RbO}_2<\mathrm{CsO}_2$ - stability

II. $\mathrm{Mg}(\mathrm{OH})_2<\mathrm{Ca}(\mathrm{OH})_2<\mathrm{Sr}(\mathrm{OH})_2$ - basic strength

III. $\mathrm{MgCO}_3<\mathrm{CaCO}_3<\mathrm{SrCO}_3$ - thermal stability

Which of the following statement is incorrect with reference to alkaline earth metals?

Which of the following, on thermal decomposition, form both acidic and basic oxides along with $\mathrm{O}_2$ ?

(i) $\mathrm{NaNO}_3$

(ii) $\mathrm{Ca}\left(\mathrm{NO}_3\right)_2$

(iii) $\mathrm{Be}\left(\mathrm{NO}_3\right)_2$

(iv) $\mathrm{LiNO}_3$

The correct option is