How many nitrogen atoms are directly bonded to the metal in [Co(NH₃)4(en)]3+?
In [Co(NH₃)4(en)]3+, 4 NH₃ provide 4 N atoms, and 1 en (bidentate) provides 2 N atoms. Total = 4 + 2 = 6.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Nomenclature of Coordination Compounds