images.collegedunia.com€¦ · 18. 19. The flame colours of metal ions are due to : (a) Frenkel...
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images.collegedunia.com€¦ · 18. 19. The flame colours of metal ions are due to : (a) Frenkel defect (b) Schottky defect (c) Metal deficiency defect (d) Metal excess defect The