# NCERT solutions for Chemistry Part 1 and 2 Class 11 chapter 9 - Hydrogen [Latest edition]

## Chapter 9: Hydrogen

EXERCISES
EXERCISES [Pages 296 - 298]

### NCERT solutions for Chemistry Part 1 and 2 Class 11 Chapter 9 HydrogenEXERCISES [Pages 296 - 298]

EXERCISES | Q 9.1 | Page 296

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

EXERCISES | Q 9.2 | Page 296

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

EXERCISES | Q 9.3 | Page 296

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

EXERCISES | Q 9.4 | Page 296

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

EXERCISES | Q 9.5 | Page 296

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

EXERCISES | Q 9.6 - (i) | Page 296

Complete the following reaction:

$\ce{H_{2(g)} + M_M O_{O(s)} ->[\Delta]}$ ?

EXERCISES | Q 9.6 - (ii) | Page 296

Complete the following reaction:

$\ce{CO_{(g)} + H_{2(g)} ->[\Delta][catalyst]}$ ?

EXERCISES | Q 9.6 - (iii) | Page 297

Complete the following reaction:

$\ce{C3H_{8(g)} + 3H2O_{(g)} ->[\Delta][catalyst]}$?

EXERCISES | Q 9.6 - (iv) | Page 297

Complete the following reaction:

$\ce{Zn_{(s)} + NaOH_{(aq)} ->[heat]}$?

EXERCISES | Q 9.7 | Page 297

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

EXERCISES | Q 9.8 - (i) | Page 297

What do you understand by electron-deficient? Provide justification with a suitable example.

EXERCISES | Q 9.8 - (ii) | Page 297

What do you understand by electron-precise? Provide justification with a suitable example.

EXERCISES | Q 9.8 - (iii) | Page 297

What do you understand by electron-rich compounds of hydrogen? Provide justification with a suitable example.

EXERCISES | Q 9.9 | Page 297

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

EXERCISES | Q 9.10 | Page 297

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

EXERCISES | Q 9.11 | Page 297

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.

EXERCISES | Q 9.12 | Page 297

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

EXERCISES | Q 9.13 | Page 297

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

EXERCISES | Q 9.14 | Page 297

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

EXERCISES | Q 9.15 | Page 297

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

EXERCISES | Q 9.16 - (i) | Page 297

Arrange the following:

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

EXERCISES | Q 9.16 - (ii) | Page 297

Arrange the following:

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

EXERCISES | Q 9.16 - (iii) | Page 297

Arrange the following:

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

EXERCISES | Q 9.16 - (iv) | Page 297

Arrange the following:

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

EXERCISES | Q 9.17 | Page 298

Compare the structures of H2O and H2O2.

EXERCISES | Q 9.18 | Page 297

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

EXERCISES | Q 9.19 | Page 297

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

EXERCISES | Q 9.20 - (i) | Page 297

Complete the following chemical reaction.

$\ce{PbS_{(s)} + H_2O_{2(aq)} ->}$ ______

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

EXERCISES | Q 9.20 - (ii) | Page 297

Complete the following chemical reaction.

$\ce{MnO^-_{4(aq)} + H_2O_{(g)} ->}$

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

EXERCISES | Q 9.20 - (iii) | Page 297

Complete the following chemical reaction.

$\ce{CaO_{(s)} + H_2O_{(g)} ->}$?

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

EXERCISES | Q 9.20 - (iv) | Page 297

Complete the following chemical reaction.

$\ce{AlCl_{3(g)} + H_2O_{(l)} ->}$ ?

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

EXERCISES | Q 9.20 - (v) | Page 297

Complete the following chemical reaction.

$\ce{Ca_3N_{2(s)} + H_2O_{(l)} ->}$ ?

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

EXERCISES | Q 9.21 | Page 297

Describe the structure of the common form of ice.

EXERCISES | Q 9.22 | Page 297

What causes the temporary and permanent hardness of water?

EXERCISES | Q 9.23 | Page 297

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

EXERCISES | Q 9.24 | Page 297

Write chemical reactions to show the amphoteric nature of water.

EXERCISES | Q 9.25 | Page 297

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

EXERCISES | Q 9.26 | Page 298

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

EXERCISES | Q 9.27 | Page 298

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

EXERCISES | Q 9.28 | Page 298

Describe the usefulness of water in biosphere and biological systems.

EXERCISES | Q 9.29 | Page 298

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

EXERCISES | Q 9.30 | Page 298

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

EXERCISES | Q 9.31 | Page 298

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

EXERCISES | Q 9.32 | Page 298

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

EXERCISES | Q 9.33 | Page 298

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.

EXERCISES | Q 9.34 | Page 298

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.

EXERCISES | Q 9.35 | Page 298

How does H2O2 behave as a bleaching agent?

EXERCISES | Q 9.36 - (i) | Page 298

What do you understand by the term hydrogen economy?

EXERCISES | Q 9.36 - (ii) | Page 298

What do you understand by the term hydrogenation?

EXERCISES | Q 9.36 - (iii) | Page 298

What do you understand by the term syngas?

EXERCISES | Q 9.36 - (iv) | Page 298

What do you understand by the term water-gas shift reaction?

EXERCISES | Q 9.36 - (v) | Page 298

What do you understand by the term fuel-cell?

EXERCISES

## NCERT solutions for Chemistry Part 1 and 2 Class 11 chapter 9 - Hydrogen

NCERT solutions for Chemistry Part 1 and 2 Class 11 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 Chemistry Part 1 and 2 Class 11 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Chemistry Part 1 and 2 Class 11 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, Structure of Water, Structure of Ice, 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, Physical Properties of Water, Soft and Hard Water, Chemical Properties of Water.

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