• question_answer Temporary hardness may be removed from water by adding [Pb. PMT 2002] A) $CaC{{O}_{3}}$ B) $Ca{{(OH)}_{2}}$ C) $CaS{{O}_{4}}$ D) HCl

$Ca{{(HC{{O}_{3}})}_{2}}+Ca{{(OH)}_{2}}\to \underset{\text{ppt}\text{.}}{\mathop{2CaC{{O}_{3}}\downarrow }}\,+4{{H}_{2}}O$