Q27 of 55 Page 1

After the ban of plastic bags, students of one school decided to create awareness among the people about the harmful effects of plastic bags on the environment and Yamuna river. To make it more impactful, they organised a rally by joining hands with other school and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All students pledged not to use polythene bags in future to save the Yamuna river.

After reading the above passage, answer the following questions:


1) what values are shown by the students?


2) What are biodegradable polymers? Give one example.


3) Is polythene a homopolymer or copolymer?


1) Students showed values like, they are aware about their environment and nature, cooperating behaviour, friendly, team work

2) Biodegradable polymers are those polymers which can be broken down by microorganisms into natural byproducts like oxygen gas, nitrogen gas, water,biomass or inorganic salts etc. or into simpler molecules from complex compounds. They do not cause any harm to the environment.


Example – PHBV (Poly β-hydroxybutyrate-co-β-hydroxy valerate).


3) Polythene is a homopolymer. Homopolymers are those which are formed after polymerization of a single monomer or they have a single repeating unit.


More from this chapter

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25

Define the following terms:

a) Anomers


b) Denaturation of proteins


c) Essential amino acids


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1) Define antihistamine with an example

2) Which one of the following drugs in an antibiotic:


Morphine, Equanil, Chloramphenicol, Aspirin


3) Why is use of aspartame limited to cold food and drink?


 28

I) A) State Raoult’s law for a solution containing volatile components. Name the solution which follow Raoult’s at all concentrations and temperatures.

B) Calculate the boiling point elevation for a solution prepared by adding 10 g of to 200 g of water. ()


OR


Define the following terms:


i) Azeotropes


ii) Osmotic pressure


iii) Colligative properties


b) Calculate the molarity of 9.8% (w/w) solution of if the density of the solution is 1.02 g/ml. (Molar mass of is 98 g/mol)


 29

A) Account for the following:

1) Bi is a strong oxidising agent in the +5 state.


2) is known but is not known.


3) dissolves in HCl to form and not


B) Draw the structures of the following:


1)


2)


OR


A) Draw the structures of the following:


i)


ii) Red


B) Account for the following:


i) Sulphur is vapour state exhibits paramagnetism


ii) Unlike, Xenon, no distinct chemical compound of Helium is known.


iii) is a stronger reducing agent than .