Which of the following compounds is insoluble in water? AgNO_(3) Ca(OH)_(2) BaCl_(2) Mg(ClO_(3))_(2)

The compound that is insoluble in water among the given options is $Ca(OH)_{2}$ (calcium hydroxide).<br /><br />Explanation:<br />- $AgNO_{3}$ (silver nitrate) is soluble in water.<br />- $Ca(OH)_{2}$ (calcium hydroxide) is insoluble in water.<br />- $BaCl_{2}$ (barium chloride) is soluble in water.<br />- $Mg(ClO_{3})_{2}$ (magnesium chlorate) is soluble in water.<br /><br />Therefore, the correct answer is $Ca(OH)_{2}$.