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

1.	What is point defects. Describe two types of point defects.
Answer» 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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(i) Arrange the following compounds in an increasing order of basic strength : `C_(6)H_(5)NH_(2), C_(6)H_(5)N(CN_(3))_(2), (C_(2)H_(5))_(2)NH and CH_(3)NH_(2)` (ii) Arrange the following compounds in a decreasing order of `pK_(b)` values: `C_(2)H_(5)NH_(2), C_(6)H_(5)NHCH_(3), (C_(2)H_(5))_(2) NH and C_(6)H_(5)NH_(2)`
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What is point defects. Describe two types of point defects.

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