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For treatment, different systems of medicine were developed, allopathy in Europe, Unani in Greece and Chinese in China.

Egyptians had the knowledge of making dwnload, dyes, glass, etc. NEET Preparation solved question bank and study notes are available at – https: To prepare for medical entrance exam – jo Your Shopping Cart is empty.

The improvement of the website and its contents ncert solutions for class 11 chemistry chapter 2 pdf download based on your suggestion and downloas. Though they did not succeed in their attempts but in the process they learnt about process like evaporation, distillation and sublimation which are of help even today. Even today we still do not know about the chemicals used for preservation of dead bodies.

And bond angle is of with all Carbons having sp2 hybridization. History of chemistry Since times immortal when the man come on earth his inquisitive nature implored him to constantly make new discoveries.

He proved that the simplest aromatic compound having six carbon atoms is Benzene.

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Benzene has high melting and moderate boiling point. Please give me materials of neet preparation – ay Choose your exam and excel with our exclusive exam prep resources.

You can read or download the file below. I want to notes of chemistry chapter 1 notes – ha Pyramids of Egypt are the examples of their progress. The branch of science under which the structure of matter, its properties, uses and interaction with other types of a matter and various forms of energy are studied is called chemistry.

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Chemists of Egypt worked for discovering touch stone, ncertt solvent and potion of life. It is an aromatic compound so it has a typical aromatic odor. What are the properties of benzene? Benzene also shows resonance that is it can exist in different forms based on the positioning of double bond and this property of benzene makes it stable. All the Carbon- carbon bonds in benzene are of same length which is equal to pm.

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If you are having any suggestion for the improvement, your are welcome. To chemistryy for medical entrance examinations please refer – https: For chemistry formulas visit – https: Chemistry Notes will be added at – https: That is why Benzene does not undergo addition reactions readily but it undergoes substitution reactions.

Benzene is the parent hydrocarbon and from which all aromatic compounds can be derived.

Accountancy Biology Business St. Chemestry formula and question and answer – br In Indus Valley Harappan civilizations chaptr BC metallurgical techniques developed for making copper and bronze articles. Enable javascript to view and download the file. Aroma in Greek means pleasant smelling. Kekule first recognised that all aromatic compounds contained at least six carbon atoms.