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NCERT solutions Chemistry Textbook for Class 11 Part 2 chapter 2 Hydrogen

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Chapter 2 - Hydrogen

Pages 288 - 290

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

Q 2 | Page 288 | view solution

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

Q 3 | Page 288 | view solution

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

Q 4 | Page 288 | view solution

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

Q 5 | Page 288 | view solution

Complete the following reactions:

Q 6.1 | Page 288 | view solution

Complete the following reactions:

Q 6.2 | Page 288 | view solution

Complete the following reactions:

Q 6.3 | Page 288 | view solution

Complete the following reactions:

Q 6.4 | Page 288 | view solution

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

Q 7 | Page 289 | view solution

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

Q 8 | Page 289 | view solution

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

Q 9 | Page 289 | view solution

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

Q 10 | Page 289 | view solution

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 11 | Page 289 | view solution

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

Q 12 | Page 289 | view solution

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

Q 13 | Page 289 | view solution

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

Q 14 | Page 289 | view solution

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 15 | Page 289 | view solution

Arrange the following

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

Q 16.1 | Page 289 | view solution

Arrange the following

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

Q 16.2 | Page 289 | view solution

Arrange the following

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

Q 16.3 | Page 289 | view solution

Arrange the following

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

Q 16.4 | Page 289 | view solution

Compare the structures of H2O and H2O2.

Q 17 | Page 289 | view solution

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

Q 18 | Page 289 | view solution

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

Q 19 | Page 289 | view solution

Complete the following chemical reactions.

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

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

Q 20.1 | Page 289 | view solution

Complete the following chemical reactions.

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

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

Q 20.2 | Page 289 | view solution

Complete the following chemical reactions.

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

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

Q 20.3 | Page 289 | view solution

Complete the following chemical reactions.

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

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

Q 20.4 | Page 289 | view solution

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 20.5 | Page 289 | view solution

Describe the structure of the common form of ice.

Q 21 | Page 289 | view solution

What causes the temporary and permanent hardness of water?

Q 22 | Page 289 | view solution

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

Q 23 | Page 289 | view solution

Write chemical reactions to show the amphoteric nature of water.

Q 24 | Page 289 | view solution

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

Q 25 | Page 289 | view solution

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

Q 26 | Page 290 | view solution

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

Q 27 | Page 290 | view solution

Describe the usefulness of water in biosphere and biological systems.

Q 28 | Page 290 | view solution

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

Q 29 | Page 290 | view solution

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

Q 30 | Page 290 | view solution

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

Q 31 | Page 290 | view solution

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

Q 32 | Page 290 | view solution

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 33 | Page 290 | view solution

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 34 | Page 290 | view solution

How does H2O2 behave as a bleaching agent?

Q 35 | Page 290 | view solution

What do you understand by the terms: hydrogen economy

Q 36.1 | Page 290 | view solution

What do you understand by the terms: hydrogenation

Q 36.2 | Page 290 | view solution

What do you understand by the terms: syngas

Q 36.3 | Page 290 | view solution

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

Q 36.4 | Page 290 | view solution

What do you understand by the terms: fuel-cell

Q 36.5 | Page 290 | view solution

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