Select the incorrect statement: (a) Stoichiometry of crystal remains uneffected due to Schottky ...

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Select the incorrect statement:
(a) Stoichiometry of crystal remains uneffected due to Schottky defect
(b) Frenkel defect is usually shown by ionic compounds having low coordination number
(c) F-centres generation is responsible factor for imparting the colour to the crystal
(d) Density of crystal always increases due to substitutional impurity defect
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