19. For the molecule ethylene (C₂H₄), determine the oxidation state, valence, and formal charge for C. Hint: valence is the number of electrons an atom uses in bonding.(A)+2, 2, 0(B)-2, 2, 2(C)-4, 4, 0(D)-2, 4, 0(E)4, 4, 0

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.

19. For the molecule ethylene (C₂H₄), determine the oxidation state, valence, and formal charge for C. Hint: valence is the number of electrons an atom uses in bonding.

(A)+2, 2, 0

(B)-2, 2, 2

(C)-4, 4, 0

(D)-2, 4, 0

(E)4, 4, 0

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