Werner theory

A, B and C are three complexes of chromium (III) with the empirical formula H_(12)O_(6)Cl_(3)Cr . All the three complexes have water and chloride ion as ligands. Complex A does not react with concentrated H_(2)SO_(4) , whereas complexes B and C lose 6.75% and 13.5% of their original weight, respectively, on treatment with concentrated H_(2)SO_(4) . According to the Werner theory, the structure of complex A is represented by :

According to Werner's theory

Write the basic postulates of Werner's theory.

According to Werner's theory of coordination compounds ,

Which of the following is not a draw back of Werner's theory?