Which of the following statement$(s)$ are correct, when alkali metals burn in the presence of oxygen?
$I$. Lithium forms monoxide
$II$. Sodium forms peroxide
$III$. Potassium, rubidium and cesium form superoxide

Sodium oxide dissolves in water to give sodium hydroxide,which indicates its:

Which compound has the lowest thermal stability?

Calcium is obtained by

Thermal decomposition of sodium nitrate at temperatures above $800\,^oC$ yields ..........

Which of the following statements are correct for alkali metal compounds?
$(i)$ Superoxides are paramagnetic in nature.
(ii) The basic strengths of hydroxides increase down the group.
(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.
(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.