Question:

The flame colours of metal ions are due to

Updated On: Jul 29, 2022
  • Frenkel defect
  • Shotkky defect
  • metal deficiency defect
  • metal excess defect
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The Correct Option is D

Solution and Explanation

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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Concepts Used:

Imperfections in Solids

Any irregularity in the pattern of crystal arrangement in a solid lattice is called imperfection in solids. The occurrence of defects takes place when crystallization (the process of formation of crystals) occurs at a very fast or at an intermediate rate.

Basically, defects fall out in two forms:

  • Point Defect

When the irregularities exist from the ideal arrangement around a point or an atom in solids, the defect is known as a point defect. Types of point defects are:

  • Stoichiometric defects
  • Non-stoichiometric defects
  • Impurity defects
  • Line Defect

When the deviation from the ideal arrangement exists in the entire row of lattice points, the defect is called line defect.