Question

Which complex compound is most stable?

Options

• [Co(NH₃)(NO₃)₃]

• [CoCl₂(en)₂]NO₃

• [Co(NH₃)₆]₂(SO₄)₃

• [Co(NH₃)₄(H₂O)Br](NO₃)₂

Answer 1

[CoCl₂(en)₂]NO₃

Explanation:

The complex compound becomes stable due to the chelation effect of (en). Chelation can be defined as “a chemical process where a chemical complex strongly attracts a mineral, forming a stable compound.”

Among the options given above, since ethylenediamine is part of compound B, the correct option is (b).