Bakelite is a:

• urea-formaldehyde resin

• phenol formaldehyde resin

• polyethylene

• artificial rubber

The common acid used in the manufacture of rayon and plastic is :

• methanoic acid

• ethanoic acid

• propanoic acid

• butanoic acid

Name the compound/ compounds used in the preparation of Nylon-66.

• ε-caprolactum

• hexamethylene diamine and adipic acid

• dimethyl terephthalate

• hexamethylene diamine

When condensation product of hexamethylenediamine and adipic acid is heated to 353 K (80° C) in an atmosphere of nitrogen for about 4-5 h, the product obtained is:

• solid polymer of nylon 66

• liquid polymer of nylon 66

• gaseous polymer of nylon 66

• Liquid polymer of nylon 6

Which one of the following is used in the preparation of styrene? 

• CH₃CHO

• P₂O₅

• CH₄

• C₆H₆

Which of the following is used in vulcanization of rubber?

• SF₆

• CF₄

• Cl₂F₂

• C₂F₂

47.

If ${\overline{\mathrm{M}}}_{\mathrm{w}}$ is the weight average molecular weight and ${\overline{\mathrm{M}}}_{\mathrm{n}}$ is the number average molecular weight of a polymer, the poly disparity index (PDI) of the polymer is given by

• $\frac{{\overline{\mathrm{M}}}_{\mathrm{n}}}{{\overline{\mathrm{M}}}_{\mathrm{w}}}$

• $\frac{{\overline{\mathrm{M}}}_{\mathrm{w}}}{{\overline{\mathrm{M}}}_{\mathrm{n}}}$

• ${\overline{\mathrm{M}}}_{\mathrm{w}} \times {\overline{\mathrm{M}}}_{\mathrm{n}}$

• $\frac{1}{{\overline{\mathrm{M}}}_{\mathrm{w}} \times {\overline{\mathrm{M}}}_{\mathrm{n}}}$

Which of the folowing is biodegradable polymer?

• Polythene

• Bakelite

• PHBV

• PVC

If the number average molecular weight and weight average molecular weight of a polymer are 40000 and 60000 respectively, the polydispersity index of the polymer will be

• >1

• <1

• 1

• zero

Which one of the following is not a biopolymer?

• Cellulose

• Nylon-6

• Insulin

• DNA