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प्रश्न
Hydrogen generally forms covalent compounds. Give reason.
उत्तर
Because of ionization enthalpy, hydrogen resembles more with halogens, is 520 kJ mol–1, F is 1680 kJ mol–1 and that of his 1312 kJ mol–1. Like halogens, it forms a diatomic molecule, combining with elements to form hydrides and a large number of covalent compounds.
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संबंधित प्रश्न
What do you understand by electron-rich compounds of hydrogen? Provide justification with a suitable example.
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactions?
Do you expect the carbon hydrides of the type (CnH2n + 2) to act as ‘Lewis’ acid or base? Justify your answer.
Arrange the following:
LiH, NaH and CsH in order of increasing ionic character.
What do you understand by electron-deficient? Provide justification with a suitable example.
What do you understand by electron-precise? Provide justification with a suitable example.
Name the classes of hydrides to which \[\ce{H2O, B2H6}\] and \[\ce{NaH}\] belong.
What do you understand by the term ‘auto protolysis of water’ ? What is its significance?
Molecular hydrides are classified as electron-deficient, electron precise and electron-rich compounds. Explain each type with two examples.
An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with \[\ce{Al2Cl6}\].
