The thermal stability of $MCO_3$ (where $M$ is an alkaline earth metal) follows the order:

The most electropositive amongst the alkaline earth metals is

Which of the following compounds has a lattice enthalpy lower than its hydration enthalpy?

Choose the correct statement from the following:
$(i)$ Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
$(ii)$ $BeO$ is an amphoteric oxide.
$(iii)$ Beryllium exhibits coordination number more than four.
$(iv)$ Beryllium oxide is purely acidic in nature.

Assertion : The ionic radii of the alkaline earth metals are smaller than those of alkali metals in the same period.
Reason : Alkali metals have higher nuclear charge than that of the alkaline earth metals.

The alkaline earth metal nitrate that does not crystallise with water molecules is