Tag: chemistry

Questions Related to chemistry

Which of the following is used in making textiles and ropes?

synthetic polyamides polymerisation chemistry

  1. Dacron

  2. Perlon - L

  3. Rayon

  4. None of the above

Show answer
Correct Option: B
Explanation:

Perlon-L is also known as nylon-$6$. It is obtained by heating caprolactum with water at a high temperature. It is used in making textiles and ropes.

Which of the following is the biodegradable polymer?

synthetic polyamides polymerisation chemistry

  1. $PHBV$

  2. $Nylon-6,6$

  3. $Nylon-6$

  4. $all$

Show answer
Correct Option: A
Explanation:

PHBV is common name of Poly $(3-hydroxybutyrate-co-3-hydroxy$ $valerate)$ which is biodegradable, non-toxic, bi compatible plastic produced naturally by bacteria. It is a thermoplastic linear aliphatic polyester.

Which of the following is an optically active polymer -

synthetic polyamides polymerisation chemistry

  1. Nylon $6,6$

  2. Natural rubber

  3. Teflon

  4. $PVC$

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Correct Option: A

Inter-particle forces present in Nylon-6,6 are 

synthetic polyamides polymerisation chemistry

  1. van der Waals

  2. hydrogen bonding

  3. dipole-dipole interactions

  4. None

Show answer
Correct Option: B

Inter-particle forces present in Nylon-6,6 are

synthetic polyamides polymerisation chemistry

  1. van der Waals

  2. hydrogen bonding

  3. dipole-dipole interactions

  4. none of the above

Show answer
Correct Option: B

Which of the following statements are correct about Nylon - $6,: 6$ ?

synthetic polyamides polymerisation chemistry

  1. Nylon fibers have higher tensile strength than teylene fibres.

  2. Nylon fibers have lower tensile strength than terylene fibres.

  3. In nylon, there is strong intermolecular H-bonding, while in terylene there is weak dipole-dipole interaction.

  4. In nylon, there is weak dipole-dipole interaction, while in terylene there is strong intermolecular H-bonding.

Show answer
Correct Option: A,C
Explanation:

Nylon - $6,:6$ has high mechanical strength and superior resistance to wear and organic chemicals.
It has more than double the strength and stiffness of unreinforced nylon.
Nylon has $-NH-CO-$ bond which results in intermolecular H-bonding.
Terlyene has no H-bonding and has only weak dipole-dipole interactions and hence, nylon - $6,:6$ has higher tensile strength compared to that of terylene.

Which of the following is a common example of fibers?

synthetic polyamides polymerisation chemistry

  1. Bakelite

  2. Buna-S

  3. Nylon - $6,: 6$

  4. Nylon - $6$

Show answer
Correct Option: C
Explanation:

Nylon-6,6 (PA66) is semicrystalline polyamide commonly used in fiber applications such as carpeting, clothing, and tire cord. 


It is also used as an engineering material in bearings and gears due to its good abrasion resistance and self-lubricating properties. 

The compound with which hexamethylene diamine on polymerization gives nylon-6,6 is:

synthetic polyamides polymerisation chemistry

  1. citric acid

  2. adipic acid

  3. oxalic acid

  4. tartaric acid

Show answer
Correct Option: B
Explanation:

Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid, which give nylon 66 its name.


$n HOOC-{(CH _2)} _4-COOH + n H _2N-{(CH _2)} _6-NH _2$ 
$\rightarrow [-OC-{( CH _2)} _4-CO-NH-{(CH _2)} _6-NH-] _n + 2n H _2O$

In which of the following polymer, monomer is not aromatic?

synthetic polyamides polymerisation chemistry

  1. Perlon - L

  2. Polyvinyl pyrrolidone

  3. PTFE

  4. Neoprene

Show answer
Correct Option: A,B,C,D
Explanation:

Porlon-L is a polyamide and a linear non-aromatic structure.

Neoprene is formed by monomer prepared by addition mechanism. PTFE and polyvinyl pyrrolidone also have non-aromatic monomer.

Which factor imparts the crystalline nature to a polymer like nylon?

synthetic polyamides polymerisation chemistry

  1. Strong intermolecular forces like hydrogen bonding between chains.

  2. Van der Waals forces between the polymeric chains.

  3. Close packing of the chains due to ionic bonding between the chains.

  4. Three-dimensional network of chains.

Show answer
Correct Option: A
Explanation:

in nylon, there is strong intermolecular hydrogen bonding between hexamethylene di ammine and di adipic acid,

the nylon is used in making sheets, bristles for brushes and in the textile industry.
so the correct option is [A].