Chemicals Found in DYES

1.    Which of the following is NOT a property of dyes?

• A.    Dyes absorb light in the visible spectrum.

• B.   They build up on the surface of the material.

• C.   They have both chromophore and conjugated systems.

• D. dye molecules are smaller than the size of the pores of the fibers.

   

2.    What is the color-bearing group in the chemical structure of a dye?

• A. Auxochrome

• B. Chromophore

• C. Conjugated system

• D. Visible spectrum

3.     Which of the statements is incorrect?

• A.    Adding more chromophores causes the bathochromic effect.

• B.    Reducing the number of auxochrome can cause a hypsochromic effect.

• C.    Decreasing the number of a conjugated system can intensify the color of the dye.

• D.     Increasing the number of chromophore conjugated to auxochrome can intensify the color of the dye.

4.    What type of dye carries a negative charge?

• A. Acid Dye 

• B. Basic Dye   

• C.    Direct Dye

• D. Vat Dye

5.    What is the perfect dye to use in hydrophobic substrate or fabric like polyesters and acetate?

• A. Direct Dye

• B. Disperse Dye

• C. Reactive Dye

• D. Sulfur Dye

6.    What is the perfect dye to use in denim fabric?

• A. Acid Dye 

• B. Azoic Dye  

• C. Sulfur Dye

•  D. Vat Dye

7.    What can you add during direct dyeing to produce cool colors on fabric?

• A. Copper sulfate  

• B. Sodium bicarbonate

• C. Sodium chloride

• D. Sulfur

8.     What is the color-helper group in the chemical structure of a dye?

• A. Auxochrome

• B. Chromophore

• C. Conjugated system

• D. Visible spectrum

9.     What is the perfect dye to use in cotton, linen, and rayon?

• A. Direct Dye

• B. Disperse Dye

• C. Reactive Dye

• D. Sulfur Dye

10.     Which of the following is also known as cold water dye?

• A. Acid Dye  

• B. Azoic Dye 

• C. Sulfur Dye

• D. Vat Dye