(D) According to Werner's theory,the secondary valence of a central metal ion is equal to its coordination number.In the complex $[Co(NH_3)_4 Cl_2]^+$

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(D) According to Werner's theory,the secondary valence of a central metal ion is equal to its coordination number.In the complex $[Co(NH_3)_4 Cl_2]^+$,the $Co^{3+}$ ion is bonded to $4$ $NH_3$ molecules and $2$ $Cl^-$ ions.Therefore,the coordination number $= 4 + 2 = 6$.Thus,the secondary valence of $Co^{3+}$ is $6$.