11. SF₆ has A₁g, Eg, and T₁u vibrational modes. The T₁u mode is(A)IR and Raman active(B)IR and Raman inactive(C)IR active, Raman inactive(D)IR inactive, Raman active

20. There are three aqueous solutions of the complex ions: [Co(NH₃)₆]³⁺, [Co(CN)₆]³⁻ and [CoF₆]³⁻. The wavelengths of absorbed light for these solutions are 770 nm, 440 nm, and 290 nm. Please match the complex ion to the wavelength of absorbed light.(A)[Co(NH₃)₆]³⁺: 770 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 290 nm.(B)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 290 nm; [CoF₆]³⁻: 770 nm.(C)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 770 nm.(D)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 290 nm.(E)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 440 nm.

11. SF₆ has A₁g, Eg, and T₁u vibrational modes. The T₁u mode is

(A)IR and Raman active

(B)IR and Raman inactive

(C)IR active, Raman inactive

(D)IR inactive, Raman active

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