Antibiotics are those chemicals which are obtained from the useful micro-organisms and are employed to kill some harmful micro-organisms. But all the antibiotics donot have medicinal importance. Discuss the following:
What should be the properties of the antibiotics to be used in medicinces?

Antibiotics are those chemicals which are obtained from the useful micro-organisms and are employed to kill some harmful micro-organisms. But all the antibiotics donot have medicinal importance. Discuss the following: Enlist the uses of antibiotics.

Antibiotics are those chemicals which are obtained from the useful micro-organisms and are employed to kill some harmful micro-organisms. But all the antibiotics donot have medicinal importance. Discuss the following: Discovery of penicillin was a serendipity. Why it is called so?

Which micro-organisms are used to prepare antibiotics?

Consider the following statements (I) Antibiotics which kill the micro-organisms are know as bactericidal drugs. (II) Antibiotics which inhibit the growth of micro-organisms are known as bacteriostatic drugs. (III) Penicilin is a board spectrum antibiotic. (II) and (III); (I), (II) and (III); (I) and (II); (I) and (III).

Diamond and Graphite are two allotropic forms of carbon. Both are covalent solids. These two froms have different structures and hence differ in physical properties. Both have their own importance in being used in everyday life. Diamond is popularly used in jewellery and graphite is extensively used as electrodes in many industrial processes. Answer the following questions Which of the allotropes is a good conductor of electricity.

Read the given passage and answers following questions : Zeolites are alumino-silicates that are micro-porous in nature. Zeolites have a honeycomb like structure, which makes them shape-selective catalysts. They have an extended 3D-nelwork of silicates in which some silicon atoms are replaced by aluminium atoms, giving them an Al-O-Si framework. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites. Zeolites are commonly used in the petrochemical industry. A catalytic reaction which depends upon the pore structure of the catalyst and on the size of the reactant and the product molecules is called shape-selective catalysis. For example, catalysis by zeolites is a shape selective catalysis. The pore size present in the zeolites ranges from 260-740 pm. Thus, molecules having a pore size more than this cannot enter the zeolite and undergo the reaction. In which chemical industry Zeolites used ?

After the ban on plastic bags, students of one school decided to make the people aware of the harmful effects of plastic bags on environment and Yamuna River. To make the awareness more impactful, they organized rally by joining hands with other schools and distributed paper bags to vegetable vendors, shop keepers and departmental stores. All students pledged not to use polythene bags in future to save Yamuna River. After reading the above passage, answer the following question : What are biodegradable polymers? Give one example?

After the ban on plastic bags, students of one school decided to make the people aware of the harmful effects of plastic bags on environment and Yamuna River. To make the awareness more impactful, they organized rally by joining hands with other schools and distributed paper bags to vegetable vendors, shop keepers and departmental stores. All students pledged not to use polythene bags in future to save Yamuna River. After reading the above passage, answer the following question : What values are shown by the students?