Which of the following ions has the largest heat of hydration?

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

$A$ metal $M$ readily forms its sulphate $MSO_4$ which is water-soluble. It forms its oxide $MO$ which becomes inert on heating. It forms its insoluble hydroxide $M(OH)_2$ which is soluble in $NaOH$ solution. Then $M$ is

Which elements are considered as alkaline earth metals? Give a brief description of them.

The hydroxides which sublime on heating are

Observe the following compounds.
$(i)$ $CaCO_3$
$(ii)$ $MgSO_4$
$(iii)$ $BaCl_2$
$(iv)$ $Sr(NO_3)_2$
$(v)$ $MgBr_2$
$(vi)$ $MgCl_2$
The oxoacid salts of group $II$ elements from the above list are