The correct order of thermal stability of hydroxides is

The number of water molecules in gypsum and plaster of paris respectively are

Beryllium and aluminium exhibit many properties which are similar. But,the two elements differ in

Portland cement contains :-
$(I)$ $Ca_2SiO_4$ $(II)$ $Ca_3SiO_5$ $(III)$ $Ca_3Al_2O_6$

Given below are two statements:
Statement $I$: None of the alkaline earth metal hydroxides dissolve in alkali.
Statement $II$: Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements,choose the most appropriate answer from the options given below:

Calcium is obtained by which of the following methods?