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Bleaching powder is produced by the action of chlorine on dry slaked lime. Which of the following is the appropriate equation for this?
$$Ca (OH)_2 + 2Cl = CaOCl_2 + H_2O$$
$$Ca (OH)_2 + Cl = 2CaOCl_2 + H_2O$$
$$Ca (OH)_2 + Cl_2 = CaOCl_2 + H_2O$$
$$Ca (OH)_2 + Cl_2 = CaOCl_2 + 2H_2O$$
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