NCERT Solutions for Class 11 Chemistry

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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.

1. Since times immortal. The man come on earth his curious nature urge him. Due to this he made new discoveries. In Indus Valley cultures making of metals techniques were found. They were make copper and bronze articles. In Egyptian culture the methods to preserve dead bodies as ‘mummies. Chemicals used for it remain mystery. Even today we do not know about the chemicals. Egyptians had the knowledge of making soap, dyes, glass, etc. Pyramids of Egypt are the examples of their progress. Chemist’ of Egypt discovered touch stone, universal solvent. They did not succeed in their attempts. They learnt about process like distillation and sublimation. These are help us even today.

2. For treatment, different systems of medicine were found. Allopathy in Europe, Unani in Greece and Chinese in China. In India, many expert in Ayurveda contributed notably. Sage Kanad termed the smallest part of as particle matter/elements. On this basis, John Dalton gave his Atomic Theory in 1808 AD. For example:. This body made from Earth, Water, Air, Fire and sky. The concept of five elements is the Research of Indian scientist only.

3. Ancient Indians had the knowledge of metallurgy, fermentation. They can prepare bases, extracts and distillates. The polish done on the ‘Iron Pillar’ of Mehrauli in Delhi. This is a subject of research. There is no rusting has occurred on it till date.

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