Question

Please answer the following questions and briefly explain

a)If your T-shirt absorbs red light what color will it appear under sunlight? Green, red, yellow or impossible to know without a spectrophotometer?

b)What is the counter ion in tetraaquodichloromoochromium(III) chloride? And What is the central metal in K₄[Fe(CN)₆]?

c)The complex ion [Fe(ox)₃]^3- has a ∆∘∆∘ of 169 kJ/mol, what color will a solution of the ion appear? Green, red, yellow or orange?

Answer 1

(a) Green.

When wavelength of a particular color is absorbed, the material shows the complementary color.

(b) Chloride anion

Counter ions are those ions which are associated with the complex ion outside to maintain electro-neutrality.

While Fe(II) is metal in the center of the complex K₄[Fe(CN)₆].

(c) [Fe(ox)3]3- is an octahedral transition metal complex and appears as fluorescent green in color.

An energy of 169 kJ/mol = ~708 nm (E=hc/) ie, the complex absorbs red color light and will show the complementary color ie, green.