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what is molecular hydride

Asked by Shubham Roy(kvnerist) , on 24/11/10


Hi Shubham,
Molecular hydrides are formed by the combination of elements of comparatively higher electronegativity. These bonds are mostly covalent in character with partly ionic character too .The general formula for covalent hydrides is XH8-n where X stands for the symbol of a metal and 'n' is the group number. Examples of molecular hydrides are: H2O, HF, PH3.
The general characteristics of molecular hydrides are:
·  These hydrides are soft.
·  They have low electrical conductivity.
·  They are generally, volatile in nature.
Hope this information helps you.
@ Rajiv 
Good effort, keep posting.

Posted by shveta.dua...on 25/11/10

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 Hydrides refer to any compound that hydrogen forms with other elements, ranging over most of the periodic table, groups 1–16.

According to the general definition every element of the periodic table (except some noble gases) forms one or more hydrides. These compounds have been classified into three main types according to the nature of their bonding:[1]

1) Ionic (saline) hydrides, which have significant ionic bonding character.

2) Covalent hydrides, which include the hydrocarbons and many other compounds which covalently bond to hydrogen atoms.

3) Interstitial hydrides, which may be described as having metallic bonding.

While these divisions have not been used universally, they are still useful to understand differences in hydrides.


Posted by Rajiv Kaparthy(KAKATIYA PUBLIC SCHOOL) on 24/11/10


 Hydrides are compounds in which hydrogen bonds with an element that strong enough of a reducing agent to be able to reduce it, such as NaH. An ionic hydride (e.g., NaH: Na+H-rxn of Na with H2) is an ionic compound much like NaCl (actually NaH has a smaller lattice energy because of the large size of the H- ion). Like NaCl it is an extended 3D lattice held together by strong electrostatic forces (ionic bonds) and consequently has a relatively high mp (~800 deg C dec). It reacts with H2O (to give H2) but most ionic salts are soluble in water and give hydrated ions due to ion-dipole interactions between the ions and the polar water molecules.
Methane, CH4, is the archetypal molecular hydride. The C-H bonds are essentially nonpolar covalent bonds with pairs of e shared between the C-H atoms. Although the C-H bonds are extremely strong, the forces between individual CH4 molecules (intermolecular forces) are extremely weak (van der Waals forces) and consequently CH4 has an extremely low bp (-161.6 °C, 112 K). It is also practically insoluble in water because there is no possibility of attractive electrostatic interactions between CH4 and H2O.

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