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NEET2008ChemistrySolid StateActual

The flame colours of metal ions are due to

Options

  1. AFrenkel defect
  2. BSchottky defect
  3. Cmetal deficiency defect
  4. 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.

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