The characteristics of electrovalent compounds
(i) The Electrovalent compounds are generally crystalline in the nature. The constituent ions are arranged in a regular way in their lattice.
(ii) The Electrovalent compounds have high melting and boiling points. Order of melting and boiling points in halides of sodium and oxides of IInd group elements is as,
NaF > NACl > NaBr > NaI, MgO > Cao > BaO
(iii) The Electrovalent compounds are hard and brittle in nature.
(iv) The Electrovalent solids do not conduct electricity. While the electrovalent compounds in the molten state or in solution conduct electricity.
(v) The Electrovalent compounds are fairly soluble in the polar solvents and insoluble in non-polar solvents.
(vi) The electrovalent bonds are non-rigid and non-directional. Hence these compound do not show the space isomerism for example geometrical or optical isomerism.
(vii) The Electrovalent compounds furnish ions in the solution. The chemical reaction of these compounds is called as the ionic reactions, these are quite fast in nature.
(viii) The Electrovalent compounds show the isomorphism.
(ix) The Cooling curve of the ionic compound is not smooth, it has two break points corresponding to the time of solidification.
(x) Ionic compounds show the variable electroCaovalency due to unstability of core and inert pair effect.
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