The purpose of vulcanization of rubber is/are -
1. To maintain the elasticity of natural rubber.
2. To improve the tensile strength of natural rubber.
3. To use for a wide range of temperatures.
4. All of the above.
The salient feature of biodegradable polymer is:
1. Polymer that can be decomposed.
2. Polymer that cannot be decomposed.
3. Polymer that can be denatured.
4. Polymer that cannot be denatured.
The presence of double bonds in rubber molecules increase -
1. Viscosity
2. Elasticity
3. Surface Tension
4. Vapour pressure
The set of monomers that forms a biodegradable polymer is:
1. H2N-CH2-COOH and H2N-(CH2)5-COOH
2. HO-CH2-CH2-OH and HOOC-C6H4-COOH
3. C6H5-CH=CH2 and CH2=CH-CH=CH2
4. CH2=CH-CN and CH2=CH-CH=CH2
Select the correct option based on statements below:
Assertion (A): | Polytetrafluoroethylene is used in making non-stick cookware. |
Reason (R): | Fluorine has the highest electronegativity. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are false. |
4. | (A) is true but (R) is false. |
Select the correct option based on statements below:
Assertion (A): | Network polymers are thermosetting. |
Reason (R): | Network polymers have a high molecular mass. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are false. |
4. | (A) is true but (R) is false. |
Select the correct option based on statements below:
Assertion (A): | For making rubber synthetically, isoprene molecules are polymerized. |
Reason (R): | Neoprene (a polymer of chloroprene) is a synthetic rubber. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
3. | (A) is false but (R) is true. |
4. | (A) is true but (R) is false. |
Select the correct option based on statements below:
Assertion (A): | Polyamides are best used as fibers because of their high tensile strength. |
Reason (R): | Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Select the correct option based on statements below:
Assertion (A): | Olefinic monomers undergo addition polymerization. |
Reason (R): | Polymerisation of vinyl chloride is initiated by peroxides/persulphates. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Select the correct option based on statements below:
Assertion (A): | Most of synthetic polymers are not biodegradable. |
Reason (R): | The polymerization process induces toxic character in organic molecules. |
1. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are false. |
4. | (A) is true but (R) is false. |