Out of the following elements,which one do you expect to be most reactive chemically?

Which of the following salts can accommodate the largest number of $H_2O$ molecules per molecule in their halide hydrates?

Give the composition of Portland cement.

Assertion : Of the various chlorides of alkaline earth metals $BeCl_2$ is covalent in nature,whereas $MgCl_2$ and $CaCl_2$ are ionic compounds.
Reason : $Be$ is the first member of group $2$.

The metal which can be extracted from all three ores: dolomite,magnesite,and carnallite is:

Give two uses of $Ca(OH)_2$.