Chemistry

This is a multiple choice answer as classified in NCERT Exemplar

(c) The most useful classification of drugs for medicinal chemists. It is on the basis of molecular targets. Target molecules are usually biomolecules like carbohydrates, lipids, proteins and nucleic acids. These drugs possess some common structural features, may have the same mechanism of action on a specific drug target.

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is b Glycogen resembles amylopectin in structure. It's a ? −D− glucose unit branched chain polymer with C₁−C₄ glycosidic linkage and C1−C6 glycosidic linkage branching. The structure of amylopectin is depicted in the diagram below.

This is a multiple choice answer as classified in NCERT Exemplar

(a) Aspirin inhibits the synthesis of compounds known as prostaglandins which stimulate inflammation in the tissues and cause pain. So, it is effective in relieving pain.

Aspirin has many other effects such as reducing fever (antipyretic) and preventing blood platelet coagulation. Because of this anti-blood clotting action, it is widely used to prevent heart.attacks. It does not make a person addictive as it is non-narcotic drug.

This is a multiple choice answer as classified in NCERT Exemplar

(c) Birth control pills contain a mixture of estrogen and progesterone derivatives. Both of these are sex hormones. Progesterone suppresses ovulation and estrogen control the menstrual cycle.

This is a multiple choice answer as classified in NCERT Exemplar

(d) Antiseptics are applied to the living tissues such as wounds, cuts and diseased skin surfaces. Antiseptic medicines such as antibiotics cannot be ingested.

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.

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.

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.

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.