Category : Education
NCERT Chemistry Class 12 : When the ratio of cations & anions are not equal (required for ideal crystal), then compounds are called non-stoichiometric compounds & defect in these compounds are called non-stoichiometric defects. The number of cations and anions present in the compounds having non – stoichiometric defects are different from those expected from their chemical formulae. There is an excess of either positive charge or negative charge in the crystal. A crystal is always neutral, so if there is an excess of negative charge, it is balanced by the presence of extra positive charge. If the positive charge is in excess, it is balanced by the presence of extra electrons. Due to this, ...
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