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What is point defects. Describe two type...

What is point defects. Describe two types of point defects.

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Point defects : Irregulatrities from ideal arrangement around a point in a crystalline sybstance.
(A) Stoichiometric defects : The point defects that do not disturb the stoichiometric defects of cation and anion as per the chemical formula of the solid called stoichiometric defects.
(B) Non-stoichiometric defects : These defects arise when stoichiometry of a substance is disturbed.
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