Free NCERT Solutions For Class 11 Chemistry Chapter 9 : Hydrogen Free PDF Download

Question 1:
Justify the position of hydrogen in the periodic table on the basis of its electronic configuration.

Question 2:
Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

Question 3:
Why does hydrogen occur in a diatomic form rather than in a monoatomic form under nomal conditions?

Question 4:
How can the production of dihydrogen, obtained from ‘coal gasification’, be increased?

Question 5:
Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process?

Question 6:
Complete the following reactions:

Question 7:
Discuss the consequences of high enthalpy of H–H bond in terms of chemical reactivity of dihydrogen.

Question 8:
What do you understand by (i) electron-deficient, (ii) electron-precise, and (iii) electron rich compounds of hydrogen? Provide justification with suitable examples.

Question 9:
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?

Question 10:
Do you expect the carbon hydrides of the type (CnH2n+2) to act as ‘Lewis’ acid or base? Justify your answer

Question 11:
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.

Question 12:
How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.

Question 13:
How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

Question 14:
Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?

Question 15:
Saline hydrides are known to react with water violently producing fire. Can CO2, a well known
fire extinguisher, be used in this case? Explain

Question 16:
Arrange the following
(i) CaH2, BeH2 and TiH2 in order of increasing electrical conductance.
(ii) LiH, NaH and CsH in order of increasing ionic character.
(iii)H–H, D–D and F–F in order of increasing bond dissociation enthalpy.
(iv)NaH, MgH2 and H2O in order of increasing reducing property.

Question 17:
Compare the structures of H2O and H2O2.

Question 18:
What do you understand by the term ’auto-protolysis’ of water? What is its significance?

Question 19:
Consider the reaction of water with F2 and suggest, in terms of oxidation and reduction, which species are oxidized/reduced.

Question 20:
Complete the following chemical reactions.

Question 21:
Describe the structure of the common form of ice.

Question 22:
What causes the temporary and permanent hardness of water?

Question 23:
Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.

Question 24:
Write chemical reactions to show the amphoteric nature of water.

Question 25:
Write chemical reactions to justify that hydrogen peroxide can function as an oxidizing as well as reducing agent.

Question 26:
What is meant by ‘demineralised’ water and how can it be obtained?

Question 27:
Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

Question 28:
Describe the usefulness of water in biosphere and biological systems.

Question 29:
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve, and (ii) hydrolyse?

Question 30:
Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes?

Question 31:
What is the difference between the terms ‘hydrolysis’ and ‘hydration’?

Question 32:
How can saline hydrides remove traces of water from organic compounds?

Question 33:
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 water.

Question 34:
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

Question 35:
How does H2O2behave as a bleaching agent?

Question 36:
What do you understand by the terms:
(i)hydrogen economy (ii) hydrogenation (iii) ‘syngas ’ (iv) water-gas shift reaction (v) fuelcell?