Which complex compound is most stable?

A $[Co(NH_3)_6]_2(SO_4)_3$

B $[Co(NH_3)_4(H_2O)Br](NO_3)_2$

C $[Co(NH_3)_3(NO_3)_3]$

D $[CoCl_2(en)_2]NO_3$

Explanation

Ethylene diamine is a bidentate chelating ligand, which increases stability.

Ethylene diamine, en is bidentate, chelating ligand. Chelating ligands increase stability due to higher entropy factor.

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