Class 11th
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6 months agoContributor-Level 10
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 hydrides.
New answer posted
6 months agoContributor-Level 10
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.
New answer posted
6 months agoContributor-Level 10
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.
2NaH(s) + B2H6 (g) → 2Na+[BH4]- (s)
&n
New answer posted
6 months agoContributor-Level 10
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 present in central atom or the central atom contains complete octet are called precise hydrides e.g., CH4, SiH4, GeH4 etc. are precise hydrides.
(iii) Electron rich hydrides: Those compounds in which central atom has one or more lone pair of excess electrons are called electron rich hydrides, e.g., NH3, H2O.
New answer posted
6 months agoContributor-Level 10
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 conditions, hydrogen reacts with many metals and non-metals to form hydrides.
New answer posted
6 months ago
Contributor-Level 10
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)
New answer posted
6 months agoContributor-Level 10
9.5. In bulk, dihydrogen can be produced by electrolysis of acidified water using Platinum electrodes.
2H2O (l) → H2 (g) + O2 (g)
Electrolyte is added to increase the dissociation of water.
New answer posted
6 months agoContributor-Level 10
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, newspapers etc. The process of producing 'syngas' from coal is called 'coal gasification'.
&nb
New answer posted
6 months agoContributor-Level 10
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.
New answer posted
6 months agoContributor-Level 10
9.2.
Mass ratio of the isotopes = Protium: Deuterium: Tritium = 1: 2 :3
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