Question
Chemistry Question on Imperfections in Solids
The flame colours of metal ions are due to
A
Frenkel defect
B
Shotkky defect
C
metal deficiency defect
D
metal excess defect
Answer
metal excess defect
Explanation
Solution
This defect arises when a compound has excess metal ion. If a negative ion is absent from its lattice site leaving a hole occupied by electron. The holes occupied by electrons are called F- centres. Greater the number of F-centres greater is the intensity of colour.