Co(NH_3)_6^3+ absorbs light in the blue region of the spectrum. The color of a s

Question

Co(NH_3)_6^3+ absorbs light in the blue region of the spectrum. The color of a solution a)blue b) blue-violet. c) violet d) yellow-orange. e) red. Complex ions with different ligands have different colors because the ligands____ a) are different colors. b) affect the energy levels of the lone-pair electrons on the metal. c) have different energies for their bonding electrons. d) affect the energy levels of the metal d orbital. c) have different energies for their lone-pair electrons. A transition metal complex ion with octahedral geometry has a value of 4.4 times 10^-19 J for the crystal What is the wavelength for the absorption maximum, lambda_max for this complex ion? a) 5.0 times 10^-15 nm b) 450 nm c) 4.5 times 10^-16 nm d) 520 mm e) 640 nm How many d electrons are there in the chromium (III) ion? a_ 0 b) 3 c) 4 d) 5 e) 2

Explanation / Answer

Ans 18.

when light passes via a solution containing transition metal complexes, we see those wavelengths of light which are transmitted. The solutions of maximum octahedral Cu (II) complexes are blue. The visible spectrum for an aqueous solution of Cu (II), [Cu(H2O6]2+, suggests that the absorption band spans the red-orange-yellow part of the spectrum and green, blue and violet are transmitted.

some ligands only produce a small energy separation among the d-orbitals even as others cause a much wider band gap. Ligands that cause a small separation are known as weak field ligands, and those that cause a big separation are called strong field ligands. The ordering in their splitting ability is referred to as the spectrochemical series.

So the Answer would be (D)

YELLOW - ORANGE

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