Question 1

With 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?

Accepted Answer

Polyethylene terephthalate (PET) is a versatile polymer used in various applications. Its fibres can indeed be blended with wool and cotton to enhance their properties, making statement 1 correct. Additionally, PET bottles are recyclable and can be converted into other products, supporting statement 3 as correct.

Question 2

Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?

Accepted Answer

Bisphenol A (BPA) is a key component in the manufacture of polycarbonate plastics. Polycarbonate is a versatile material known for its clarity, impact resistance, and heat resistance, making it suitable for various applications such as eyeglass lenses, electronic components, and food containers. BPA is used in the production of polycarbonate plastics, raising concerns due to its potential health risks.

Question 3

Consider the following statements: 1. Carbon fibres are used in the manufacture of components used in automobiles and aircrafts. 2. Carbon fibres once used cannot be recycled. Which of the statements given above is/are correct?

Accepted Answer

Carbon fibres are indeed used in the manufacture of components in automobiles and aircraft due to their lightweight and high strength properties. However, it is incorrect to say that carbon fibres cannot be recycled. In fact, carbon fibres can be recycled and reused in various industries, making them a sustainable material choice.

Question 4

Consider the following substances: I. Ethanol II. Nitroglycerine III. Urea. Coal gasification technology can be used in the production of how many of them?

Accepted Answer

Coal gasification technology can be used in the production of ethanol and urea. Ethanol can be produced from syngas obtained during coal gasification, while urea can be synthesized from ammonia, which is a byproduct of coal gasification. Nitroglycerine is not produced using coal gasification technology.

Chemistry - Organic Chemistry — UPSC Previous Year Questions

Year-wise Distribution

Sample Questions

Chemistry - Organic Chemistry — UPSC Previous Year Questions

Year-wise Distribution

Sample Questions