In the reaction of chlorine with dry slaked lime, the oxidation number of chlorine changesi) from -1 to +1ii) from +1 to -1iii) from zero to -1iv) from zero to +1The correct combination is

Cl2 + Ca(OH)2 → CaOCl2 + H2OCaOCl2 is a mixed salt it contains Ca+2,Cl- and ClO-Oxidation states of 'Cl' in bleaching powder are -1 & +1During reaction oxidation state of chlorine changes from zero to -1 and to +1