d) PHBV . Non stick cook wares generally have a coating of a polymer, whose monomer is a) ethane b) prop- -enenitrile c) chloroethene d) , , , -tetrafluoroethane . Assertion: -methyl- , -butadiene is the monomer of natural rubber Reason: Natural rubber is formed through anionic addition polymerisation. a) If both assertion and reason are true and reason is the correct explanation of assertion.
b) if both assertion and reason are true but reason is not the correct explanation of assertion. c) assertion is true but reason is false. d) both assertion and reason are false. .
Which of the following is a co-polymer? a) Orlon b) PVC c) Teflon d) PHBV . The polymer used in making blankets (artificial wool) is a) polystyrene b) PAN c) polyester d) polythene . Regarding cross-linked or network polymers, which of the following statement is incorrect?
(NEET) a) Examples are Bakelite and melamine b) They are formed from bi and tri-functional monomers c) They contain covalent bonds between various linear polymer chains d) They contain strong covalent bonds in their polymer chain XII U15 Chemistry in XII U15 Chemistry in - - - - Short Answer Questions . What are antibiotics? . Name one substance which can act as both analgesic and antipyretic .
Write a note on synthetic detergents . How do antiseptics differ from disinfectants? . What are food preservatives?
. What are drugs? How are they classified . How the tranquilizers work in body.
. Write the structural formula of aspirin. . Explain the mechanism of cleansing action of soaps and detergents .
Which sweetening agent are used to prepare sweets for a diabetic patient? . What are narcotic and non – narcotic drugs. Give examples .
What are anti fertility drugs? Give examples. . Write a note on co –polymer .
What are bio degradable polymers? Give examples. . How is terylene prepared?
. Write a note on vulcanization of rubber . Classify the following as linear, branched or cross linked polymers a) Bakelite b) Nylon- , c) LDPE d) HDPE XII U15 Chemistry in XII U15 Chemistry