Question

Identify the type of crystal defect found in \(NaCl\) crystals.

• A. Frenkel defect
• B. Schottky defect
• C. Metal excess defect
• D. Interstitial defect

Hint:

Crystals like \(NaCl\), \(KCl\), and \(CsCl\) commonly exhibit Schottky defects due to similar ion sizes.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks for the characteristic stoichiometric defect present in Table Salt (\( NaCl \)).
The topic is Solid State.
Step 2: Key Formula or Approach:
Stoichiometric defects are classified mainly into Schottky and Frenkel defects based on the relative size of ions.
Step 3: Detailed Explanation:
In \( NaCl \), the sizes of the cation (\( Na^+ \)) and the anion (\( Cl^- \)) are comparable.
When ions of similar sizes are present, the crystal tends to show the Schottky defect.
This defect involves the missing of an equal number of cations and anions from their lattice positions to maintain electrical neutrality.
Step 4: Final Answer:
\( NaCl \) exhibits the Schottky defect.