Crystal stability decreases, upon stoich...

Crystal stability decreases, upon stoichiometric defects. Why ?

Text Solution

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Solid crystals are very stable because of orderly arranged particles in systematic lattices.
Eventhough stoichiometry is maintained, due to point defects, systematicity is lost and crystal stability decreases.

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(A) In HX , stability decreases down the group (R ) Bond dissociation enthalpy oeder of HX is H-FgtH-ClgtH-BrgtH-I

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

(A) is true but (R ) is false

Both (A) and (R ) are false

The alkali metals form salt like hydrides by direct synthesis at elevated temperatures. The thermal stability of these hydrides decreases in which of the following orders ?

`NaH gt LiH gt KH gt RbH gt CsH`

`LiH gt NaH gt KH gt RbH gt CsH`

`CsH gt RbH gt KH gt NaH gt LiH`

`KH gt NaH gt LiH gt CaH gt RbH`

The increase in stability and decrease in energy of aromatic compounds is due to

Localization of pi electrons

Delocalization of s electrons

Localization of s electrons

Delocalization of pi electrons