please answer the following: If an object appears violet to your eyes, approxima

Question

please answer the following:

If an object appears violet to your eyes, approximately what wavelength light is it absorbing? What are "conjugated double bonds"? Does an increase in conjugated bonds of a molecule shift that molecule's maximum absorption to a lower or greater wavelength in UV-Vis absorption? Explain why the coupling of the diazonium salt with a phenol or an aromatic amine occurs at the para position. 2. 3. 4. Postlab Questions I. Why concentrated sulfuric acid was added to the dye solution in Part C? 2. When preparing the diazonium salt, the solution is tested with potassium iodide-starch paper. A positive test is the immediate formation of a blue color. What is the KI-starch paper testing for? Explain. Explain why the addition of the HCl or NaOH improves the ability of azo dyes to dye fabrics. Explain why silk and wool are more easily dyed with azo dyes than other fabrics like nylon or cotton. 3. 4.

Explanation / Answer

2. Any object absorbs a particular wavelength of light and appears its complementary colour to the observer .

The complementary colours are as follows :

Violet - yellow

Green - red

Blue - orange .

As our given object appears violet ,so it absorbed yellow light ( complementary to violet) and thus it absorbed light of wavelength 550-570nm (yellow light) and emit violet light .

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