Statement-1 :Schottky type of defect is shown by crystals with high co-ordination numbers .
Statement-2 :In Schottky defect , equal number of cations and anions are missing from their lattice sites

Options

A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1
B. Statement-1 is true, statement-2 is true, statement-2 is not correct explanation for statement-1
C. Statement-1 is true, statement-2 is false
D. Statement-1 is false, statement-2 is true

Answer

To analyze the given statements regarding Schottky defects in solid-state chemistry, let's break down the problem step by step.

### Step 1: Understand Schottky Defects
A Schottky defect occurs in ionic crystals when equal numbers of cations and anions are missing from their lattice sites. This type of defect is crucial for maintaining electrical neutrality in the crystal structure.

**Hint:** Recall that Schottky defects involve the absence of ions, and the balance of charges is essential.

### Step 2: Evaluate Statement 1
**Statement 1:** "Schottky type of defect is shown by crystals with high coordination numbers."

- **Analysis:** Crystals with high coordination numbers typically have a close-packed structure, which allows for a more significant presence of Schottky defects. The radius ratio of cation to anion approaches 1 in such structures, making it favorable for Schottky defects to occur.

**Hint:** Consider the relationship between coordination number and the stability of the crystal structure.

### Step 3: Evaluate Statement 2
**Statement 2:** "In Schottky defect, equal number of cations and anions are missing from their lattice sites."

- **Analysis:** This statement is true. The definition of a Schottky defect explicitly states that for every cation missing, there is a corresponding anion missing to maintain electrical neutrality in the crystal.

**Hint:** Think about how charge balance is maintained in ionic compounds.

### Step 4: Determine the Relationship Between Statements
Now that we have evaluated both statements:
- **Statement 1** is true.
- **Statement 2** is also true.

However, Statement 2 does not explain Statement 1. While both statements are true, the fact that Schottky defects occur in high coordination number crystals does not depend on the equal loss of cations and anions.

**Hint:** Consider whether one statement logically explains the other or if they are simply both true independently.

### Conclusion
Based on the evaluations:
- **Statement 1** is true.
- **Statement 2** is true.
- Statement 2 is not a correct explanation for Statement 1.

Thus, the correct interpretation is that both statements are true, but Statement 2 does not explain Statement 1.

### Final Answer
The correct option is that **Statement 1 is true, Statement 2 is true, and Statement 2 is not a correct explanation for Statement 1.**