Tag: chemistry

Questions Related to chemistry

Which of the following is a plastic?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Abaca

  2. Polystyrene

  3. Mohair

  4. None of above

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Correct Option: B
Explanation:

Polystyrene is one of the most widely used plastics. They are polymer of styrene. They are used for making containers, disposable cups, lids, plates, cutlery etc. Abaca and Mohair are natural fibres.

Which names are associated with PMMA?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Melmac

  2. Acrilan

  3. Saran

  4. Acrilite

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Correct Option: D

Which is used in making of thermocol ?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Polypropylene

  2. Polyethylene

  3. Polystyrene

  4. High density polyethylene

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Correct Option: C
Explanation:

Polystyrene is used to make disposal plastic such as thermocol.


Option C is correct.

Polyacrylamide gel is prepared by mixing acrylamide and ______________ at fixed proportions.

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. glycol

  2. bisacrylamide

  3. hydrazine

  4. none of the above

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Correct Option: B
Explanation:

$\text{Polyacrylamide gel= Acerylamide+Bisacrylamide.}$

Teflon is an example of polymer which is a/an

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. polyamide

  2. addition Ploymer

  3. polyster

  4. formaldehyderesin

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Correct Option: B
Explanation:

TEFLON  -  It is an addition polymer prepared by heating tetrafluoroetane with a free radical.
      $n CF _{2} = CF _{2}  \xrightarrow[High  pressure]{Catalyst} -[CF _{2}-CF _{2}-] _{n}$
   Tetrafluoroetane                                   Teflon
POLYAMIDE  -  These are polymers possessing amide linkage and Teflon doesn't contain any amide linkage.
POLYSTER -  These are polycondensation products of dicarboxylic acids and diols.
FORMALDEHYDE  RESIN - It can refer to many formaldehyde polymers such as melamine formaldehyde, urea formaldehyde, phenol formaldehyde.

For natural polymers, PDI is generally ___

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. $0$

  2. $1$

  3. $100$

  4. $1000$

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Correct Option: B
Explanation:

For natural polymers, PDI (Polydispersity Index) is generally equal to $1$, which means that they are monodisperse. Such polymers are more homogeneous.

Orlon is a polymer of:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. isoprene

  2. acrolein

  3. glycol

  4. vinyl cyanide

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Correct Option: B
Explanation:
Orlon is the trade name of Polyacrylonitrile (PAN) and is a polymer of acrylonitrile (acrolein).
$CH _2=CH-C\equiv N$
Hence, the correct option is B.

The monomers of Buna-S polymers are:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. vinyl chloride and vinylidene

  2. styrene and butadiene

  3. acrylonitrile and butadiene

  4. isobutylene and isoprene

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Correct Option: B
Explanation:
Styrene and butadiene 
Because with styrene, rubbers are harder and less rubbery and butadine also influence the property.

Which of the following polymers shows a sharp melting point?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Butyl rubber

  2. Polystyrene

  3. Bakelite

  4. Nylon-6,6

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Correct Option: B

$PMMA$ is a:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Polyamide

  2. Copolymer

  3. Step growth polymer

  4. Addition polymer

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Correct Option: B