Ca, Ba and Sr ions are precipitated in fifth group as their -

On the addition of a solution containing CrO_(4)^(2-) ions to the solution of Ba^(2+), Sr^(2+) and Ca^(2+) ions, the precipitate obtained first will be of:

On the addition of few drops of a solution containing CrO_(4)^(2-) ions to the solution of Ba^(2+), Sr^(2+) and Ca^(2+) ions, the precipitate obtained first will be of:

On addition of a solution containing CrO_4^(2-) ions to the solution of Ba^(2+), Sr^(2+) , and Ca^(2+) ions, the precipitate obtained first will be of

The alkaline earth metals Ba,Sr ,Ca and Mg may be arranged in the order of their decreasing first ionzation enthalpy as ____.