93: Plastics, Polymers & Everyday Products

How does vulcanization make natural rubber more durable?

Consider the following statements regarding soaps and detergents:

1. Soaps are sodium salts of fatty acids, whereas detergents are generally sodium salts of sulphonic acids.
2. Addition of soaps and detergents to water increases the surface tension of water.

Which of the above statements is/are correct?

Consider the following statements regarding Organic Light Emitting Diodes (OLEDs):

1. They use a series of thin films in their structure.
2. They produce brighter light using less energy in comparison to LEDs.
3. They are composed of hydrocarbon chains.

Which of the above statements is/are correct?

Consider the following statements about Carbon nanotubes:

1. Carbon nanotubes are good conductors of electricity and heat.
2. They are much longer tubes with small diameters.
3. They are used as adsorbent in removal of various inorganic and organic pollutants from polluted water.

Which of the above statements is/are correct?

Consider the following statements regarding hard water and soft water:

1. Hard water contains high concentrations of calcium and magnesium ions, while soft water contains higher levels of sodium ions.
2. Hard water does not lather easily with soap, whereas soft water lathers easily with soap.

Which of the above statements is/are correct?