(a) Name one compound of calcium that is used for removing the color of colored cloth.
(b) State a peculiar (or remarkable) property of plaster of Paris.
(c) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.
Answer:
(a) To remove the color, bleaching powder or calcium oxychloride ( CaOCl2) is employed.
(b) When water is added to the plaster of Paris, it hardens into a solid mass.
(c) The action of chlorine on solid slaked lime produces bleaching powder or calcium oxychloride (CaOCl2).