Q3 / 90 · JEE Main 2021 (26 Aug Shift 1) · Chemistry

Given below are two statements:
Statement I : Frenkel defects are vacancy as well as interstitial defects.
Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres.

Choose the most appropriate answer for the statements from the options given below:

  • A
    Statement I is false but Statement II is true
  • B
    Both Statement I and Statement II are false
  • Correct answer
    C
    Statement I is true but Statement II is false
  • D
    Both Statement I and Statement II are true

Solution

A Frenkel defect is another form of a point defect which is created when an atom or cation leaves its original place in the lattice structure to create a vacancy while occupying another interstitial position within the solid crystal. Frenkel defect is dislocation defect, it is not interstitial defect, and it is not responsible for colour of solid.

Hence, the correct answer is option: 'C'.

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