In context with beryllium,which one of the following statements is incorrect?

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal compounds due to

An alkaline earth metal $(M)$ gives a salt with chlorine,which is insoluble in water at room temperature but soluble in boiling water. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called 'lithopone' - a white pigment. Metal $M$ is

Choose the correct statements from the following:
$(I)$ In vapour phase $BeCl_2$ exists as a chlorobridged dimer.
$(II)$ $BeSO_4$ is readily soluble in water.
$(III)$ $BeO$ is completely basic in nature.
$(IV)$ $BeCO_3$ being unstable, is kept in an atmosphere of $CO_2$.
$(V)$ $BeCO_3$ is the least soluble among all the carbonates of group $2$ elements.

Which of the following decreases on going gradually from $Be$ to $Ba$ in the periodic table?

Which of the following statements is not correct regarding the gas evolved by the reaction of dilute $HCl$ on $CaCO_3$?