# NCERT solutions for Class 11 Chemistry Textbook chapter 9 - Hydrogen [Latest edition]

## Chapter 9: Hydrogen

[Page 288]

### NCERT solutions for Class 11 Chemistry Textbook Chapter 9 Hydrogen [Page 288]

Q 1 | Page 288

Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

[Pages 288 - 290]

### NCERT solutions for Class 11 Chemistry Textbook Chapter 9 Hydrogen [Pages 288 - 290]

Q 2 | Page 288

Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

Q 3 | Page 288

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

Q 4 | Page 288

How can the production of dihydrogen, obtained from ‘coal gasification’, be increased?

Q 5 | Page 288

Describe the bulk preparation of dihydrogen by the electrolytic method. What is the role of an electrolyte in this process?

Q 6.1 | Page 288

Complete the following reactions:

Q 6.2 | Page 288

Complete the following reactions:

Q 6.3 | Page 288

Complete the following reactions:

Q 6.4 | Page 288

Complete the following reactions:

Q 7 | Page 289

Discuss the consequences of high enthalpy of H–H bond in terms of chemical reactivity of dihydrogen.

Q 8 | Page 289

What do you understand by (i) electron-deficient, (ii) electron-precise, and (iii)electron-rich compounds of hydrogen? Provide justification with suitable examples.

Q 9 | Page 289

What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?

Q 10 | Page 289

Do you expect the carbon hydrides of the type (CnH2n + 2) to act as ‘Lewis’ acid or base? Justify your answer.

Q 11 | Page 289

What do you understand by the term “non-stoichiometric hydrides”? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer.

Q 12 | Page 289

How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.

Q 13 | Page 289

How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

Q 14 | Page 289

Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?

Q 15 | Page 289

Saline hydrides are known to react with water violently producing fire. Can CO2, a well-known fire extinguisher, be used in this case? Explain.

Q 16.1 | Page 289

Arrange the following

CaH2, BeH2 and TiH2 in order of increasing electrical conductance.

Q 16.2 | Page 289

Arrange the following

LiH, NaH and CsH in order of increasing ionic character.

Q 16.3 | Page 289

Arrange the following

H–H, D–D and F–F in order of increasing bond dissociation enthalpy.

Q 16.4 | Page 289

Arrange the following

NaH, MgH2 and H2O in order of increasing reducing property.

Q 17 | Page 289

Compare the structures of H2O and H2O2.

Q 18 | Page 289

What do you understand by the term ’auto-protolysis’ of water? What is its significance?

Q 19 | Page 289

Consider the reaction of water with F2 and suggest, in terms of oxidation and reduction, which species are oxidized/reduced.

Q 20.1 | Page 289

Complete the following chemical reactions.

PbS_(s) + H_2O_(2(aq)) ->

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Q 20.2 | Page 289

Complete the following chemical reactions.

MnO_(4(aq))^(-) + H_2O_(g)->

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Q 20.3 | Page 289

Complete the following chemical reactions.

CaO_((s)) + H_2O_((g)) ->

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Q 20.4 | Page 289

Complete the following chemical reactions.

AlCl_(3(g)) + H_2O_((l)) ->

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Q 20.5 | Page 289

Complete the following chemical reactions.

Ca_3N_(2(s)) + H_2O_((l)) ->

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

Q 21 | Page 289

Describe the structure of the common form of ice.

Q 22 | Page 289

What causes the temporary and permanent hardness of water?

Q 23 | Page 289

Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.

Q 24 | Page 289

Write chemical reactions to show the amphoteric nature of water.

Q 25 | Page 289

Write chemical reactions to justify that hydrogen peroxide can function as an oxidizing as well as reducing agent.

Q 26 | Page 290

What is meant by ‘demineralised’ water and how can it be obtained?

Q 27 | Page 290

Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

Q 28 | Page 290

Describe the usefulness of water in biosphere and biological systems.

Q 29 | Page 290

What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?

Q 30 | Page 290

Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes?

Q 31 | Page 290

What is the difference between the terms ‘hydrolysis’ and ‘hydration’?

Q 32 | Page 290

How can saline hydrides remove traces of water from organic compounds?

Q 33 | Page 290

What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards the water.

Q 34 | Page 290

Do you expect different products in solution when aluminium (III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified water, and (iii) alkaline water? Write equations wherever necessary.

Q 35 | Page 290

How does H2O2 behave as a bleaching agent?

Q 36.1 | Page 290

What do you understand by the terms: hydrogen economy

Q 36.2 | Page 290

What do you understand by the terms: hydrogenation

Q 36.3 | Page 290

What do you understand by the terms: syngas

Q 36.4 | Page 290

What do you understand by the terms: water-gas shift reaction

Q 36.5 | Page 290

What do you understand by the terms: fuel-cell

## NCERT solutions for Class 11 Chemistry Textbook chapter 9 - Hydrogen

NCERT solutions for Class 11 Chemistry Textbook chapter 9 (Hydrogen) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Class 11 Chemistry Textbook solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 11 Chemistry Textbook chapter 9 Hydrogen are Position of Hydrogen in the Periodic Table, Dihydrogen, Preparation of Dihydrogen, Properties of Dihydrogen, Ionic Or Saline Hydrides, Covalent Or Molecular Hydride, Metallic Or Non-stoichiometric (Or Interstitial) Hydrides, Physical Properties of Water, Structure of Water, Structure of Ice, Chemical Properties of Water, Hard and Soft Water, Temporary Hardness of Water, Permanent Hardness of Water, Preparation of Hydrogen Peroxide, Physical Properties of Hydrogen Peroxide, Structure of Hydrogen Peroxide, Chemical Properties of Hydrogen Peroxide, Storage of Hydrogen Peroxide, Uses of Hydrogen Peroxide, Heavy Water, Dihydrogen as a Fuel.

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