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Chapter 9

Hydrogen

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NCERT Solutions for Class 11 chemistry hydrogen is a crucial topic that requires a deep understanding of concepts related to hydrogen. Hydrogen is one of the most prevalent gases in the universe; therefore, students are advised to go through it thoroughly to explore and develop a robust understanding of numerous scientific phenomenons. 

At MSVGo, we have tailored the NCERT Solutions for Class 11 Chemistry Hydrogen according to our student’s needs, which will help them score higher grades and crack entrance examinations. Each answer is prepared by our subject experts who understand the complexities involved; therefore, they’ve followed step-by-step procedures to explain each concept in detail, making it easier for students to grasp things in a better way. 

To help students be thorough about each concept regarding chemistry hydrogen, our experts have curated questions, worksheets, MCQs, and HOTS with detailed explanations to help students understand concepts better. Let’s go through our guide to understand all core principles, elaborated in easy-to-understand language that will answer every query of your NCERT Textbook.

Topics Covered in this Chapter: (Content Table)

Sr. No 

Chapter Name 

1

Hydrogen (Introduction)

2

Position Of Hydrogen In The Periodic Table 

3

Dihydrogen

4

Preparation of Dihydrogen

5

Properties of Dihydrogen

6

Hydrides 

7

Water 

8

Hydrogen Peroxide (H2 O2) 

9

Heavy Water,D2OD

10

Dihydrogen as a Fuel 

Hydrogen (Introduction)

Owing to the vastness of this chapter, it is classified into various topics. The first topic in NCERT Solutions for Class 11 Hydrogen is the introduction of hydrogen which offers a detailed analysis of the role of hydrogen in everyday life and its uses. Hydrogen is the lightest atom with only a single electron. However, it has three isotopes, including deuterium, protium, and tritium, which are radioactive.

Being one of the most important topics in class 11 chemistry, Hydrogen holds high marks weightage, allowing students to score good marks in the final examination. This chapter is specially designed to make students understand hydrogen’s properties, uses, reactions, and other relative factors. Besides it being an important element, 80% of the total mass in the universe is hydrogen alone, which is insane. That being said, the Hydrogen NCERT solution for Class 11 Chapter 9 is well-curated to help students understand concepts and answer questions in exams.

Since the atomic number of hydrogen is one which also points that hydrogen has a single electron in its atom, it is the first element that stands in the periodic table. Depending upon the electronic configuration, the placement of the elements is decided in the periodic table.

Although the positioning of hydrogen is a big question among scientists and researchers due to its properties when it loses an electron and forms a cation, it is similar to alkali metals. However, if the hydrogen gains an electron and becomes a uni-negative ion, it resembles halogens. Though it shows resemblance to alkali metals and halogens, it is way different than both.

Dihydrogen is a homonuclear diatomic molecule, a combination of two hydrogen atoms. Since hydrogen is placed at number one in the periodic table as it's the lightest element with an atomic weight of 1.008u, the dihydrogen is the lightest molecule whose molecular weight is 2.016 atomic mass units.

NCERT Solutions for Chapter 9 Hydrogen includes all questions and answers that are part of the CBSE textbook and previous year's questions to help students learn the concept of dihydrogen in detail. Our experts have curated these answers, which provide detailed descriptions about dihydrogen and applications of dihydrogen. So, if you're looking for an all-in-one solution in an easy-to-understand language, go for MSVGo NCERT Solutions for Chapter 9 Hydrogen.

Preparation of Dihydrogen

To help students be thorough about each concept regarding the preparation of dehydration, NCERT Solutions for Chapter 9 Hydrogen explains the step-by-step procedure for the preparation of dihydrogen. One of the popular ways which scientists follow for preparing dihydrogen is by reacting zinc with acid. The reaction results in zinc forming Zinc Sulphate.

The second popular method of preparing dihydrogen is by reacting zinc with alkaline. The combination of sodium and zinc gives rise to dihydrogen as the third element.

Properties of Dihydrogen

The following are the properties of dihydrogen- 

  • At STP, dihydrogen is present in the gaseous form only. 
  • The melting point of dihydrogen is -259.16 degrees celsius.
  • The boiling point of dihydrogen is termed to be 20.271 on the Kelvins scale.
  • The sound speed through gaseous dihydrogen is 1310 meters per second.

Also known as the anion of hydrogen, hydrides are hydrogen compounds with fewer electronegative elements. If the hydrogen reacts with any of the elements and forms the compound, the compound formed is known as hydrides. Further hydrides are divided into three major parts- 

  •  Ionic or saline hydrides - Example: Nah, KH, CaH2, etc. 
  • Covalent hydrides - Example: SiH4 (silane)
  • Metallic hydrides - Example: Cadmium, TiH aluminum, magnesium, etc.

IUPAC Name

Hydride

Molecular Formula

H–

Molecular Weight

1.008 g/mol

Chemical Name

Hydrogen Anion

 

The next topic in class 11, hydrogen is water. Earth is covered with more than 70% of water; therefore, a glance of earth from space appears to be blue. This blue colour is water with the chemical formula H2O. Each molecule of water is made from two hydrogen atoms with one oxygen atom. Since mankind has existed on this planet, water has been a life-driving force needed in almost every task from housing activities to drinking, bathing, cooking, etc. Although water is distributed unevenly on the earth’s surface, it is present in various forms.

Properties of water- 

Chemical formula

H2O

Molar mass

18.01528(33) g/mol

Odour

None

Acidity (pKa)

13.995

Boiling point

99.98 °C (211.96 °F; 373.13 K)

Melting  point

0.00 °C (32.00 °F; 273.15 K)

Density 

 

Solid:

0.9167 g/ml at 0 °C

Liquid:

0.961893 g/mL at 95 °C

0.9970474 g/mL at 25 °C

0.9998396 g/mL at 0 °C

Vapour pressure

3.1690 kilopascals or 0.031276 atm

Basicity (pKb)

13.995

Refractive index(nD) 

1.3330 (20°C)

Thermal conductivity

0.6065 W/m·K

Viscosity

0.890 cP

One of the simplest peroxides, hydrogen peroxide, is almost a colourless liquid (pale blue) used for safety. It is majorly used as a bleaching agent and as a disinfectant.

Hydrogen peroxide Chemical formula

H2O2

Molecular Weight/ Molar Mass

4.0147 g/mol

Density

1.05 g/cm3

Boiling Point

150.2 °C

Melting Point

-0.43 °C

Properties of Hydrogen peroxide- 

  • The melting point of Hydrogen peroxide is 272.4 K and boiling point 423 K. 
  • In its purest state, it is almost colourless or pale blue.

Also known as deuterium oxide, heavy water is a compound that is a combination of oxygen and deuterium. The chemical formula of heavy water is D2O.

Properties of heavy water-

Heavy Water (Deuterium Oxide)

D2O

Molecular Mass

20.02 grams/mole

Density

1.107 g/mL

Dipole moment

1.87 D

Melting Point

3.82oC

Boiling Point

101.4oC

Students studying in class 11 must have come across the term dihydrogen. The last topic of chapter 9,  class 11, hydrogen, is dihydrogen as a Fuel. Dihydrogen is used as a fuel as it has a high heating value which delivers sufficient flame and improved ignition temperature. As dihydrogen is large in quantity, it is used as a fuel for commercial purposes. 

1- What are the uses of hydrogen Class 11? 

One of the most prominent uses of hydrogen is Ammonia synthesis. Also, it is used as rocket fuel when combined with oxygen.

2- What are the physical properties of hydrogen? 

The following are physical properties of hydrogen- 

  • Hydrogen has the lowest density in all gases with no color or smell. 
  • Hydrogen is termed clean gas and is helpful for the future, which emerges from the water and oxidises. 
  • Hydrogen is present in abundance in the universe. 
  • It can be produced from various sources and stored easily in large amounts. 
  • Hydrogen was first generated in the early 16th century.

3- What are the benefits of Class 11 hydrogen?

The following are the advantages of hydrogen- 

  • Hydrogen is a rich source of energy where there’s no possibility of running out. 
  • Hydrogen can be produced easily through numerous sources 
  • It is termed to be a clean gas for the future use 
  • Hydrogen is a non-toxic gas which makes it environmentally friendly 
  • When combined with oxygen to produce electricity or refill rockets, it significantly reduces pollution. 

 

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