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Question
Assertion: The presence of Frenkel defect in a crystal lowers its density.
Reason: Frenkel defect involves the creation of a hole in the lattice of a crystal due to migration of a cation from its lattice site to an interstitial site.
Options
If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
If Assertion is CORRECT but Reason is INCORRECT.
If Assertion is INCORRECT but Reason is CORRECT.
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Solution
If Assertion is INCORRECT but Reason is CORRECT.
Explanation:
A Frenkel defect does not lower the density of a crystal because no ions are missing from the lattice, only displaced. The reason is true because the defect involves a cation leaving its lattice site and occupying an interstitial position, creating a vacancy (hole) in the lattice.
