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Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $\require{mhchem}\ce{Co3+}$ is

(a) $\ce{[Co(H2O)6]^3+, [Co(en)3]^3+, [Co(NH3)6]^3+}$

(b) $\ce{[Co(H2O)6]^3+, [Co(NH3)6]^3+, [Co(en)3]^3+}$

(c) $\ce{[Co(NH3)6]^3+, [Co(en)3]^3+, [Co(H2O)6]^3+}$

(d) $\ce{[Co(en)3]^3+, [Co(NH3)6]^3+, [Co(H2O)6]^3+}$
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