Answer all three questions, i) - iii). (0.5 marks each) i) Transition metal comp

Question

Answer all three questions, i) - iii). (0.5 marks each)

i) Transition metal complexes often exhibit colour. From the statements below, select which explains this phenomenon best:

a) When transition metal complexes emit visible light, the observed colour corresponds to the wavelength of the emitted light.

b) When transition metal complexes emit visible light, the observed colour corresponds to the complementary colour of the emitted light.

c) When transition metal complexes absorb visible light, the observed colour corresponds to the wavelength of the absorbed light.

d) When transition metal complexes absorb visible light, the observed colour corresponds to the complementary colourof the absorbed light.

ii) If a cobalt containing complex yields blue crystals, which of the following approximate wavelengths is likely to be closest to the absorbed visible light?

a) 375 nm

b) 475 nm.

c) 575 nm.

d) 675 nm.

iii) If a transition metal complex has two absorbances in the visible region at 430 nm and 662 nm, predict the colour of it's crystals?

a) blue

b) green

c) red

d) violet

Explanation / Answer

i) Transition metal complexes often exhibit colour. From the statements below, select which explains this phenomenon best:

a) When transition metal complexes emit visible light, the observed colour corresponds to the wavelength of the emitted light.

b) When transition metal complexes emit visible light, the observed colour corresponds to the complementary colour of the emitted light.

c) When transition metal complexes absorb visible light, the observed colour corresponds to the wavelength of the absorbed light.

d) When transition metal complexes absorb visible light, the observed colour corresponds to the complementary colourof the absorbed light.

The correct statement is

d) When transition metal complexes absorb visible light, the observed colour corresponds to the complementary colourof the absorbed light which not absorbs by the metal complex.

ii) If a cobalt containing complex yields blue crystals, which of the following approximate wavelengths is likely to be closest to the absorbed visible light?

a) 375 nm

b) 475 nm.

c) 575 nm.

d) 675 nm.

The correct answer is

b) 475 nm.

Because the wave length of blue light is range 450 to 495 nm

iii) If a transition metal complex has two absorbances in the visible region at 430 nm and 662 nm, predict the colour of it's crystals?

a) blue

b) green

c) red

d) violet

430nm means blue light and 662nm means red light than the complementary color of these lights are green thus the color of complex is GREEN

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