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

An element of group $2$ forms a covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Identify the element and write chemical reactions of the hydroxide of the element with an alkali and an acid.

Which of the following fluorides has the lowest melting point?

What is obtained when quicklime is heated with coke in an electric furnace?

Write the preparation,properties,and uses of calcium carbonate $(CaCO_3)$.

Select the elements belonging to the same group from the following list: