Ncert Solutions Chemistry Class 11th
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9.12. How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.
9.12. How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.
9.12. Metallic hydrides are useful for ultra-purification of dihydrogen and as dihydrogen storage media. In metallic hydrides, hydrogen is adsorbed as H-atoms. Due to the adsorption of H atoms the metal lattice expands and become unstable. Thus, when metallic hydride is heated, it decomposes to
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9.11. What do you understand by the term “non-stoichiometric hydrides”? Do you expect this type of hydrides to be formed by alkali metals? Justify your answer.
9.11. What do you understand by the term “non-stoichiometric hydrides”? Do you expect this type of hydrides to be formed by alkali metals? Justify your answer.
9.11. Those hydrides which do not have fix composition are called non-stoichiometric hydrides, and the composition varies with temperature and pressure. This type of hydrides is formed by d- and f-block elements. They cannot be formed by alkali metals because alkali metal hydrides form ionic hy
Upvote 9.10. Do you expect the carbon hydrides of the type (CnH2n+2) to act as ‘Lewis’ acid or base? Justify your answer.
9.10. Do you expect the carbon hydrides of the type (CnH2n+2) to act as ‘Lewis’ acid or base? Justify your answer.
9.10. Carbon hydrides of the type CnH2n+2 are electron precise hydrides. Because they have atom with exact number of electrons to form covalent bonds. Thus, they do not behave as Lewis acid or base. Since they have no tendency to accept or lose electrons.
Upvote 9.9. What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?
9.9. What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?
9.9. It is expected to be a Lewis acid. They are likely to accept electrons to become stable. They can form coordinate bond with electron rich compound.
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Upvote 9.8. What do you understand by (i) electron-deficient, (ii) electron-precise, and (iii) electron-rich compounds of hydrogen? Provide justification with suitable examples.
9.8. What do you understand by (i) electron-deficient, (ii) electron-precise, and (iii) electron-rich compounds of hydrogen? Provide justification with suitable examples.
9.8. (i) Electron deficient hydrides: Compounds in which central atom has incomplete octet, are called electron deficient hydrides. For example, BeH2, BH3 are electron deficient hydrides.
(ii) Electron precise hydrides: Those compounds in which exact number of electrons are pres
Upvote 9.7. Discuss the consequences of high enthalpy of H-H bond, in terms of chemical reactivity of dihydrogen.
9.7. Discuss the consequences of high enthalpy of H-H bond, in terms of chemical reactivity of dihydrogen.
9.7. This is due to its small atomic size and small bond length (74 pm) of H-H bond.H? H bond has very high bond enthalpy (435.9 kJ/mol) which results in low reactivity at room temperature. The reactivity is increased at high temperature or in presence of catalyst. Under these conditi
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9.6. (i) 3H2?(g)+2MoO3? ? Mo2?O3?+3H2?O(l)
(ii) CO (g) + H2 (g) ? CH3OH
(iii) C3H8 (g) + 3H2O(g) ? 3CO + 7H2(g)
(iv) Zn (s) + NaOH (aq) ? Na2ZnO2(s) + H2(g)
Upvote 9.5. Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process?
9.5. Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process?
9.5. In bulk, dihydrogen can be produced by electrolysis of acidified water using Platinum electrodes.
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Upvote 9.4. How can the production of dihydrogen, obtained from ‘coal gasification’ be increased?
9.4. How can the production of dihydrogen, obtained from ‘coal gasification’ be increased?
9.4. The production of dihydrogen in coal gasification can be increased by reacting CO present in syngas mixtures with steam in the presence of iron chromate as the catalyst. This is called the water-gas shift reaction. Synthesis gas or 'syngas' is produced from sewage, sawdust, scrap wood, newspape
Upvote 9.3. Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?
9.3. Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?
9.3. In diatomic form, the K-shell of hydrogen is complete (1s2) and so it is quite stable. That is why hydrogen occurs in a diatomic form rather than in a monoatomic form.
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