Which of the following will not give a flame test?

Point out the incorrect statement regarding $Be$ (Group-$IIA$):

$A$ compound $(A)$ is used in the preparation of washing soda to recover ammonia in the Solvay process. When $CO_2$ is bubbled through an aqueous solution of $(A)$,the solution turns milky. It is used in whitewashing due to its disinfectant nature. What is the chemical formula of $(A)$?

Magnesia is

Identify the option in which the trends corresponding to hydroxides of group $2$ elements (from $Mg(OH)_2$ to $Ba(OH)_2$) are correctly shown:

Basic character

Chemical stability

Solubility

Which of the following sets represents the alkaline earth metals?