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Question

Assertion: Both Frenkel and Schottky defects are stoichiometric defects. Reason: Both defects change the density of the crystalline solid.


  1. Both Assertion and Reason are false.

  2. Assertion is true, but Reason is false.

  3. Both Assertion and Reason are true. The reason is the correct explanation of Assertion.

  4. Both Assertion and Reason are true. The reason is not the correct explanation of Assertion.

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Solution

The correct option is B

Assertion is true, but Reason is false.


The explanation for Assertion statement

Stoichiometric defects

  • “These are the point defects that do not disturb the stoichiometry of the solid.”
  • Another name for this defect is intrinsic or thermodynamic defects.
  • Schottky and Frenkel's defects are both stoichiometric defects.

Frenkel defect

  • “This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site.”

Schottky defect

  • In ionic solids, it's basically a vacancy defect.
  • The number of missing anions and cations must be equal to maintain electrical neutrality.

The explanation for Reason statement

  • In the Frenkel defect, density is not changed.
  • The Schottky defect decreases the density of the substance.
  • So, the reason statement is incorrect.

So, the assertion is true but the reason is false. Hence, option (B) is the correct answer.


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