^ith reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements : 1. Its fibres can be blended with wool and cotton fibres to reinforce their properties. 2. Containers made of it can be

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Q: 46 (IAS/2022)
^ith reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements :
1. Its fibres can be blended with wool and cotton fibres to reinforce their properties.
2. Containers made of it can be used to store any alcoholic beverage.
3. Bottles made of it can be recycled into other products.
4. Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions.
Which of the statements given above are correct ?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,135,60,135,17,16,27

keywords: 

{'polyethylene': [0, 0, 0, 1], 'fibres': [1, 0, 0, 3], 'cotton fibres': [0, 0, 0, 1], 'incineration': [3, 0, 0, 1], 'wool': [4, 1, 2, 4], 'greenhouse gas emissions': [0, 0, 2, 2], 'containers': [0, 0, 0, 1], 'articles': [1, 0, 0, 1], 'alcoholic beverage': [0, 0, 0, 1]}

The correct statements regarding polyethylene terephthalate are:

  1. Its fibres can be blended with wool and cotton fibres to reinforce their properties.
  2. Bottles made of it can be recycled into other products.

Statement 2 is incorrect because PET bottles are not suitable for storing certain types of alcoholic beverages, such as those with high alcohol content or acidic content.

Statement 4 is also incorrect because incineration of PET articles releases carbon dioxide, which is a greenhouse gas. Therefore, recycling of PET is a more sustainable option than incineration.

 

Preparing for Future Exams: Learning from the Analysis of Past Questions

Topics:

  • Polymer chemistry
  • Properties and uses of polyethylene terephthalate (PET)
  • Recycling and disposal of PET products

Sources:

  • Textbooks on chemistry or materials science
  • Scientific journals on polymer chemistry or materials science
  • Websites of organizations involved in waste management or recycling,.

NCERT and reference book chapters:

  • Class 12 Chemistry NCERT textbook, Chapter 15 "Polymers"

Related concepts:

  • Monomers and polymers
  • Polymerization reactions
  • Polymer structure and properties
  • Recycling methods and technologies
  • Life cycle assessment of products

It is not feasible to study every possible topic in advance, especially in the case of current affairs questions. Such questions are typically based on recent events and trends. Therefore, it is crucial to select specific topics from current affairs by scanning newspapers and magazines and then study the relevant information in detail, cross-referencing with other theoretical materials. Attempting to cover every possible topic beforehand is impractical and may not yield desirable results. Therefore, it is recommended to focus on understanding the key concepts and current trends in a few selected areas rather than trying to cover everything

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