Chemistry NCERT Exemplar Solutions Class 12th Chapter Fifteen
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New answer posted
3 months agoContributor-Level 10
Vulcanization of rubber is carried out by heating a mixture of isoprene and sulphur.
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3 months agoContributor-Level 10
Copolymer is the polymer formed by two or more monomers having multiple bonds.
Buna – S, PHBV and butadiene – styrene are copolymers. Neoprene is homopolymer.
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3 months agoContributor-Level 10
No. of Amino acid units are 4 and
No. of peptide bonds are 3
In tetrapeptide
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3 months agoContributor-Level 10
Buna-N is obtained by copolymerization of 1, 3-butadiene and acrylonitrile,
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3 months agoContributor-Level 10
This is a Short Answer Type Questions as classified in NCERT Exemplar
Sugars are mainly classified into two configurations: D− configuration and L− configuration, each of which have individual distinct structures. These configurations are expressed in terms of the standard glyceraldehyde which are basically of two types:
D− (+)− Glyceraldehyde and L− (−)− Glyceraldehyde. The D− configuration has −OH attached to the carbon near to −CH2OH on the right, whereas the L− configuration has −OH attached to the carbon adjacent to −CH2OH on the left. The sugars are designated D− and L− depending on whether the molecul
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3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.
Explanation: Most of the Synthetic polymers are not biodegradable. A large number of the polymers are resistant to the degradation process of the environment and therefore, are responsible for the accumlation of polymeric solid waste material.
New answer posted
3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(i) Assertion and reason both are correct statements but reason does not explain assertion.
Explanation: Thermosetting polymers are cross linked polymers. They are highly branched polymers with high molecular masses. These polymers on heating undergo cross linking in moulds. They become infusible on heating.
New answer posted
3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(v) Assertion is wrong statement and reason is correct statement.
Explanation: Synthetic rubber is a type of rubber polymer that are capable of getting stretched to twice of its length. They are homopolymers of either 1,3-butadiene derivatives or copolymers of butadiene. Polychloroprene or neoprene is a type of synthetic rubber.
New answer posted
3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(ii) Assertion and reason both are correct statements and reason explains the assertion.
Explanation: Polyamides are best used as fibres because of high tensile strength. They have the strongest intermolecular forces of attraction like hydrogen bonding. It lead to close packing of chains and increase the crystalline character.
New answer posted
3 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
(i) Assertion and reason both are correct statement but reason does not explain assertion.
Explanation: Olefinic monomers undergo addition polymerisation. The molecules of the same monomer or different monomer are added together to form this type of polymer. This mode of polymerisation leads to an increase in chain length.
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