Two complex ions containing Ni are [Ni(NH 3 ) 6 ] 2+ , which is blue, and [Ni(en) 3 ] 2+ , which is purple.Which one of these statements is true?

The color of a complex is due to the absorption of light, and the color observed is complementary to the color absorbed. Since [Ni(en) 3 ] 2+ is purple, it absorbs yellow light, which has a higher energy than the red light absorbed by the blue [Ni(NH 3 ) 6 ] 2+ .

Two complex ions containing Ni are [Ni(NH 3 ) 6 ] 2+ , which is blue, and [Ni(en) 3 ] 2+ , which is purple.Which one of these statements is true?

The color of a complex is due to the absorption of light, and the color observed is complementary to the color absorbed. Since [Ni(en) 3 ] 2+ is purple, it absorbs yellow light, which has a higher energy than the red light absorbed by the blue [Ni(NH 3 ) 6 ] 2+ .

Solved

Two Complex Ions Containing Ni Are [Ni(NH₃)₆]²⁺, Which Is Blue $\Delta$

Question 55

Multiple Choice

Two complex ions containing Ni are [Ni(NH₃) ₆]²⁺, which is blue, and [Ni(en) ₃]²⁺, which is purple.Which one of these statements is true?

A) The crystal field splitting energy ( $\Delta$ ) is greater for [Ni(NH₃) ₆]²⁺ than for [Ni(en) ₃]²⁺.
B) [Ni(en) ₃]²⁺ absorbs light in the violet region of the spectrum.
C) Both complex ions are diamagnetic.
D) The energy of the photon absorbed by [Ni(en) ₃]²⁺ is greater than that absorbed by [Ni(NH₃) ₆]²⁺.
E) The wavelength of the light absorbed by [Ni(en) ₃]²⁺ is greater than the wavelength absorbed by [Ni(NH₃) ₆]²⁺.