Hydrogen Class 11 Notes CBSE Chemistry Chapter 9 [Free PDF Download]

About Hydrogen Revision Notes

Firstly, we can say that hydrogen is the lightest atom, which has only one electron. Further, the loss of this electron results in an elementary particle, which is the proton. Furthermore, this is a unique characteristic property of hydrogen. Moreover, hydrogen has three isotopes, which are called deuterium, protium, and tritium. Among all these three isotopes, only the tritium is radioactive. On the other side, it resembles both halogens and alkali metals. Most noteworthy is that it has occupied a separate position in the periodic table because of its unique properties. Also, it cannot be found in the earth’s atmosphere, in its free state.

On the industrial scale, the dihydrogen is prepared by the water-gas shift reaction from the petrochemicals. Furthermore, the dissociation enthalpy of the H-H bond of dihydrogen is the highest for a single bond between the two atoms of any element. Moreover, this property is used in a hydrogen torch, which can be ideal for welding. Besides, the reducing reaction of dihydrogen leads to the formation of methanol, hydrogen halides, ammonia, water, and more. In addition, the heavy water is the other important compound that is formed by the electrolytic enrichment of normal water.

Sub-topics Covered Under Hydrogen

Let us look at some of the sub-topics that fall under the Hydrogen chapter.

• Hydrogen Position in the Periodic Table - This topic highlights hydrogen and its respective position in the periodic table.

• Hydrides - This topic describes the hydrides and their various types.

• Dihydrogen - This topic teaches about the dihydrogen in detail.

• Preparation and Properties of Dihydrogen - This topic tells the overview of the preparation of dihydrogen and its properties as well.

• Water - This topic tells about water and its physical, chemical properties, along with its structure.

• Heavy Water and Hydrogen Economy - This topic covers heavy water, its uses, whether it is safe to consume, and the hydrogen economy.

• Hydrogen Peroxide - This particular topic defines hydrogen peroxide, its preparation method, its structure, and its uses.

Importance of Class 11 Chemistry Hydrogen

Hydrogen is also an important topic in Chemistry. It matches to the realtime applications and uses in our daily lives. By studying this topic, students can get a good score in their final examinations and know about its real uses and applications and how to use it when necessary for realtime. The revision notes provided here at Vedantu help the students get a clear understanding of the topic and help them answer the questions given in the exams.

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Students, by choosing their learning platform, as Vedantu, will be benefitted as given below.

• They can clear their doubts about the topic, Hydrogen, before going for the final examination.

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Position of Hydrogen in the Periodic Table

Let us get to know the details of hydrogen about its position in the periodic table.

• It is the lightest element which is having the atomic number 1.

• It is also used as a Dihydrogen.

• It resembles both halogens and alkali metals, and therefore, its respective position is anomalous.

• In the modern periodic table, it is separately located.

Advantages for Using a Revision Notes

Let us look at aome some advantages of using Revisoin Notes.

Increase Attention Span

Considering learning, Study Notes or Revision notes promote retention. While learning is an imperative tutoring part, retention is an essential end goal. Preparing a revision notes promotes positive memory and the ability to retain information because the mind becomes active in studying. Not only the students do understand things better while writing in their own words with their handwriting, but they can also retain it for a longer time.