Write a concise note on the topic HYDROGEN. Use the following subtopics: isotopes of hydrogen, unique position of hydrogen in the periodic table, physical properties of hydrogen, chemical properties of hydrogen, laboratory preparation of hydrogen, industrial preparation of hydrogen, and uses of hydrogen.
Answers
Answer:
Answer:HYDROGEN
•Isotopes of hydrogen:
1. Protium H
2. Deuterium D
3. Tritium T
The difference in rate of reaction of these isotopes is due to the difference in atomic masses.
• Position of hydrogen:
At the same time hydrogen shows resemblances and differences with alkali metals and halogens. So hydrogen is seperately placed in the periodic table.
• Properties of hydrogen:
At standard temperature and pressure, hydrogen is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas with the molecular formula H2.
• Laboratory preparation of hydrogen:
It can be prepared by the reaction of zinc with aqueous alkali.
Zn+2NaOH→ Na2ZnO2 + H2
•Industrial preparation of hydrogen:
It is prepared by coal gamification followed by water gas shift reaction.
°coal gasification_steam is passed over coke at 1270K to form water gas(mixture of CO and H2) Or syn gas.
°water gas shift reaction_syn gas is mixed with excess steam and passed over iron chromate at 673K to form a mixture of CO2 and H2
CO2 is removed by sodium arsenite solution.
•Uses of hydrogen:
1. In the manufacture of ammonia, methanol, and synthetic petrol.
2. In the hydrogenation of vegetable oil.
3. As rocket fuel
Explanation:
Answer:
Hydrogen (H), a colourless, odourless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements. The hydrogen atom has a nucleus consisting of a proton bearing one unit of positive electrical charge; an electron, bearing one unit of negative electrical charge, is also associated with this nucleus. Under ordinary conditions, hydrogen gas is a loose aggregation of hydrogen molecules, each consisting of a pair of atoms, a diatomic molecule, H2. The earliest known important chemical property of hydrogen is that it burns with oxygen to form water, H2O; indeed, the name hydrogen is derived from Greek words meaning “maker of water.”
Although hydrogen is the most abundant element in the universe (three times as abundant as helium, the next most widely occurring element), it makes up only about 0.14 percent of Earth’s crust by weight. It occurs, however, in vast quantities as part of the water in oceans, ice packs, rivers, lakes, and the atmosphere. As part of innumerable carbon compounds, hydrogen is present in all animal and vegetable tissue and in petroleum. Even though it is often said that there are more known compounds of carbon than of any other element, the fact is that, since hydrogen is contained in almost all carbon compounds and also forms a multitude of compounds with all other elements (except some of the noble gases), it is possible that hydrogen compounds are more numerous.
Elementary hydrogen finds its principal industrial application in the manufacture of ammonia (a compound of hydrogen and nitrogen, NH3) and in the hydrogenation of carbon monoxide and organic compounds.
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