Among the alkaline earth metals $(Group \, 2)$ $Be, Mg, Ca,$ and $Sr$,which one forms the least ionic chloride?

$A$ chemistry student wants to identify the metal ion in a salt. They make a paste of the salt with concentrated $HCl$ on a clean platinum wire loop. If they take a small amount of this paste and place it in a non-luminous flame,it produces a green flame. Which metal is present?

Why is beryllium amphoteric in nature?

Predict the feasibility of the given reactions in aqueous solution:
$(i)$ $Be(OH)_2 + 2 OH^{-} \longrightarrow [Be(OH)_4]^{2-}$
$(ii)$ $Be(OH)_2 + 2 H^{+} \longrightarrow Be^{2+} + 2 H_2O$

Sorel's cement is:

Which ion has the maximum complex-forming tendency?