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51
__________ of rubber decreases after its vulcanisation.
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Answer: Option B
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52
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to
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Answer: Option A
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53
Rosin soap is added during paper manufacture to
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Answer: Option C
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54
Sulphuric acid is mainly used in the __________ industry.
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Answer: Option A
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55
Massacuits is a terminology used in the __________ industry.
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Answer: Option D
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56
Acrylonitrile is mainly used in the __________ industry.
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Answer: Option D
Solution:
Acrylonitrile is an important organic chemical compound with the molecular formula C₃H₃N. It is a colorless, volatile liquid used primarily as a monomer in the production of various polymers and copolymers.

The polymer industry is the main consumer of acrylonitrile, as it serves as a key raw material for manufacturing synthetic fibers, plastics, and rubbers.

The most common polymers produced from acrylonitrile include:

1. Polyacrylonitrile (PAN): Used in making acrylic fibers, which are employed in textiles, carpets, and outdoor fabrics.

2. Acrylonitrile Butadiene Styrene (ABS): A tough and rigid plastic used in automotive parts, electronic housings, and consumer goods.

3. Styrene Acrylonitrile (SAN): Used in making clear and heat-resistant plastics.

Acrylonitrile is not used significantly in printing, dyeing, or photographic industries, as its primary applications are in polymer synthesis and related chemical manufacturing.

Therefore, acrylonitrile is mainly used in the polymer industry.

Hence, the correct answer is Option A: Polymer.
57
Most commonly used rubber vulcanising agent is
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Answer: Option A
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58
Blue colour is imparted to glass by the addition of
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Answer: Option C
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59
Oils and fats are converted to soap in a process called
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Answer: Option C
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60
Sea weeds are an important source of
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Answer: Option D
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