AIIMS 2008
- Exam
- AIIMS
- Year
- 2008
- Subject
- Chemistry
- Chapter
- Solid State
AIIMS 2008 · Chemistry · Solid State
The flame colours of metal ions are due to
The flame colours of metal ions are due to
Options
- AFrenkel defect
- BSchottky defect
- Cmetal deficiency defect
- Dmetal excess defect.
Correct answer
D. metal excess defect.
Step-by-step 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.