For viva..pl as soon as possible 

Asked by jain.pradeep | 19th Jan, 2020, 11:06: PM

Expert Answer:

Question(1) What is major difference between synthetic fibre and natural fibre?
 
Answer: Fibres which are obtained from plants and animals are called natural fibres. For e.g., wool, silk, jute etc.
             Fibres which are manmade are called as synthetic or artifical fibres. For e.g., Nylon, Teflon, Rayon etc.
 
 
Question(2) What are the characteristics/properties of Rayon?
 
Answer: It is highly adsorbent, soft and comfortable, easy to dye, Drapes well.
 
Question(3) Why do we use Filter Paper for this experiment?
 
Answer: Filterpaper is madeup of Cellulose and therfore a source of natural fibre is required.
 
Question(4) What is the precaution using filter paper?
 
Answer: The quantity of filter paper dissolved should be limited. Too much amount of filter paper clogs the syringe nozzle and does not allow solution to pass through it.
 
Quesytion(5) What is cellulose?
 
Answer: Cellulose is a polysachharide found in the cell wall of plant cells. It consists of linear chain of beta linked D-Glucose units.
 
Question(6) What is the source of cellulose for industrial preparation of Rayon?
 
Answer: In the industrial process, cellulose is obtaianed from wood usually form Pine, Spruce or Hemlock teees and cotton linters which are the residue fibres that cling to cotton seeds after ginning process.
 
Question (7) How is cupric hydroxide precipitate is separated from ammonium sulphate?
 
Answer: The cupric hydroxide is filtered and filtrate is washed out with water. Presence of ammonium sulphate is checked by using Barium Chloride. A white precipitate of Barium Chloride indicates presence of ammonium sulfate.
 
Question (8) What are the main types of Rayon?
 
Answer: Acetate Rayon and Viscose Rayon.

Answered by Ravi | 20th Jan, 2020, 11:44: AM