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# The relative of $Ca,Sr,Mg$ and $Ba$ with water follow the order:

$\begin {array} {1 1} (a)\;Sr > Ba > Mg > Ca & \quad (b)\;Ba > Sr > Ca > Mg \\ (c)\;Ca > Mg > Ba > Sr & \quad (d)\;Sr > Ca > Mg > Ba \end {array}$

$(b)\;Ba &gt; Sr &gt; Ca &gt; Mg$