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Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $$Co^{3+}$$ is
$$[Co(H_2 O)_6]^{3+} , [Co(NH_3)_6]^{3+}, [Co(en)_3]^{3+}$$
$$[Co(NH_3)_6]^{3+} , [Co(en_3)]^{3+}, [Co(H_2O)_6]^{3+}$$
$$[Co(en)_3]^{3+} , [Co(NH_3)_6]^{3+}, [Co(H_2O)_6]^{3+}$$
$$[Co(H_2 O)_6]^{3+} , [Co(en_3)]^{3+}, [Co(NH_3)_6]^{3+}$$
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