A : AgBr shows both Schottky and Frenkel defect.
R : AgBr is a crystalline solid.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To determine the correctness of the statements regarding AgBr, we need to analyze both statements A and R:

**Statement A:** AgBr shows both Schottky and Frenkel defects.

**Statement R:** AgBr is a crystalline solid.

### Step 1: Understanding Schottky and Frenkel Defects
- **Schottky Defect:** This defect occurs when equal numbers of cations and anions are missing from the lattice, creating vacancies. In the case of AgBr, when one Ag+ and one Br- ion are removed, the overall stoichiometry remains the same, but the density decreases due to the presence of vacancies.

- **Frenkel Defect:** This defect occurs when a cation (usually smaller in size) leaves its position in the lattice and occupies an interstitial site, creating a vacancy in its original position. In AgBr, the smaller Ag+ ion can move to an interstitial site, while leaving a vacancy behind.

### Step 2: Analyzing Statement A
- Since AgBr can exhibit both types of defects (Schottky and Frenkel), **Statement A is true.**

### Step 3: Understanding Crystalline Solids
- **Crystalline Solid:** A crystalline solid has a well-defined, ordered structure that extends in three dimensions. AgBr is indeed a crystalline solid as it has a regular arrangement of ions in its lattice.

### Step 4: Analyzing Statement R
- Since AgBr is a crystalline solid, **Statement R is also true.**

### Step 5: Conclusion
- Both statements A and R are true. Therefore, the answer to the question is that both statements are correct.

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