The compounds of alkaline earth metals have the following magnetic nature:

Which of the following is $NOT$ true for alkaline earth metals?

Which of the following substances is insoluble in water?

$Y$ $\xleftarrow{\Delta ,\, 205^\circ C}$ $CaSO_4 \cdot 2H_2O$ $\xrightarrow{\Delta ,\, 120^\circ C}$ $X$. $X$ and $Y$ are respectively

Which of the following is least thermally stable?

Which element among the alkaline earth metals primarily forms covalent compounds?