Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its

Plasticisers are added to polymers to improve their

A

Tensile strength

B

Softness & flexibility

C

Acid resistance

D

Alkali resistance

Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?

A

Ethylene glycol

B

Stearic acid estors

C

Tricresyl phosphate

D

Esters of phthalic acid

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

A

Low impact strength

B

High flexibility

C

Better finish and surface appearance

D

High plastic deformation

Plasticisers are added to synthetic plastics to

A

Impart flexibility

B

Improve workability during fabrication

C

Develop new improved properties not present in the original resin

D

All of the above

Plasticisers are added to paints to

A

Make it corrosion resistant

B

Make glossy surface

C

Give elasticity & prevent cracking of the film

D

Increase atmospheric oxidation

Which of the following has the weakest intermolecular forces?

A

Buna-N

B

Nylon-6,6

C

Polythene

D

Polystyrene

Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces?

A

RT

B

$${\text{p}} + \frac{{\text{a}}}{{{{\text{V}}^2}}}$$

C

V - b

D

$$\frac{1}{{{\text{RT}}}}$$

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

A

Base and strong acid

B

Base and weak acid

C

Acid and weak base

D

None of these

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

A

Explosive

B

Soap

C

Detergent

D

Analgesic drug

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A

30°

B

60°

C

90°

D

120°

Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its

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