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Yogita Ingle 5 years, 8 months ago
Two strategies adopted to identify social differences among the Harappans are:
1. Burials- How the death are buried, what artefacts are buried along with it does help in identifying social differences.
2. Luxury goods- Archaeologists assume objects were luxuries if they are rare or made from costly, non-local materials or with complicated technologies. By the availability of it we can assume the existence of social differences. For example larger town like Harappa or Mohenjodaro have large evidence of luxury goods whereas smaller settlement like kalibangan did not.
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Meghna Thapar 5 years, 8 months ago
5 chemistry discoveries that changed the world are:
1. The first discovery was penicillin. It was discovered on Friday, September 28 by Alexander Fleming. He discovered it by observing a mould that was mistakenly left out and was growing around a Petri dish.
2. The second discovery was the Haber-Bosch Process. In short, it is the combustion of atmospheric hydrogen with nitrogen to produce ammonia. This played a pivotal role when it was turned into a crop fertilizer, giving consumable plants the ability to intake nitrogen.
3. The third discovery is polythene. From hard hats to plastic bags, it's the most common plastic found in products today. In 1898, Hans von Pechmann discovered something waxy at the bottom of his tube. The funny thing is that he was studying something completely different, making the discovery accidental. He and his fellow scientists studied the substance and found out that it was composed of very long molecular chains. These chains were later termed polymethylene.
4. The fourth discovery would have to go to radiation. The study of radiation took many years. In 1896, Henri Becquerel began studying the properties of x-rays by using naturally fluorescent minerals. He then did an experiment using potassium uranyl sulfate on photographic plates in which he wrapped the plates in black paper and exposed them to sunlight. He originally thought that the uranium would absorb the sun rays in which they would be emitted as x-rays.
5. The final discovery that has played a role in all of our lives in the 21st century is the LCD screen. This dated back to the 1960s in Britain. The British Military wanted new flat screens in vehicles rather than the old bulky and rather expensive cathode ray tubes. This brought up the discussion of Liquid Crystal Displays, or LCDs.
Posted by Siddharth Tiwari 5 years, 8 months ago
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Abhi Maurya 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
The main cause of food shortage in India after partition was that the food surplus areas of West Punjab and Sindh went to Pakistan.
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Yogita Ingle 5 years, 8 months ago
- Article 370 is a constitutional provision that gave Jammu and Kashmir its special status.
- The provision was incorporated in Part XXI of the Constitution: Temporary, Transitional and Special Provisions.
- As evident from the title of the Part, it was supposed to be a temporary provision and its applicability was projected to last till the formulation and adoption of the State’s constitution.
- It restricts the Parliament’s legislative powers with respect to the state of J&K.
Posted by Abhay Khajuria 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
It is the study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc. Some applications of surface chemistry are known as surface engineering. There are various phenomena taking place on the surface of a substance and out of them some are:
- Adsorption
- Heterogeneous Catalysis
- Corrosion
- Crystallization
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Yogita Ingle 5 years, 8 months ago
Semi-permeable Membrane: Some membranes appear to be continuous but they have minute pores through which small molecules can pass. Such a membrane is called semi-permeable membrane.
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Yogita Ingle 5 years, 8 months ago
- At a given temperature liquids vaporize. At equilibrium the pressure exertedby the vapour of the liquid over the liquidphase is referred to as vapour pressure.
- According to Raoult’s law, vapour pressure of a volatile component in a given solution ca be defined by pi = pi 0 xi
- In an answer of a gas in a fluid one of the segments is volatile to the point that it exists as a gas and solvency is given by Henry's law which expresses that p = KH x
- Comparing both the equations we get that partial pressure of the volatile component or gas is directly proportional to its mole fraction in solution. Proportionality constant KH differs from p10
- Therefore, Raoult's law turns into a unique instance of Henry’s law in which KH get to be equivalent to p10.
Posted by Pankaj Singh 5 years, 8 months ago
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Posted by Krishn Kant 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
(a) Catalyst have no effect on the value of Gibbs Energy (ΔG) of a reaction.
(b) Catalyst lower the value of activation energy (Ea).
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Vivek Kumar 5 years, 8 months ago
1Thank You