What is the meaning of `loose of identity ` and `retaining of properties of doublesalt are same as of their constituents` .....

@ meher 
its the diffrence between double salt and the coordination compound complex. 
actually what happens when u will dissolve double salt in water they will dissociate into constituent ions and loose all of the property of constituent ions . 
but when u dissolve a coordination compound , in water then it will not dissociate into its constituents and all of the property of constituents will remain as always . 

HOPE IT CLEARS NOW