First slide
Werner's theory

According to werner theory Duel valency of central atom in  CrH2O6Cl3 Complex is 


 The ligand satisfy primary and secondary valency is called duel valency, that means ligand involved in calculation of primary and secondary valency. Hence no Cl- act as primary and secondary valency in given complex CrH2O6Cl3 , so duel valency  of  CrH2O6Cl3 Complex is 3

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