Statement-1. The value of van der Waals constant 'a' is higher for ammonia than for nitrogen.
Statement-2 Intermoleucular hydrogen bonding is percent in ammonia.

Options

A. Statement-1 is correct, Statement-2 is correct , Statement-2 is the correct explanation for Statement-1.
B. Statement-1 is correct, Statement-2 is correct , Statement-2 is not a correct explanation of Statement-1.
C. Statement-1 is correct, Statement-2 is incorrect.
D. Statement-1 is incorrect, Statement-2 is correct.

Answer

To analyze the statements provided, we will break down the information step by step.

### Step 1: Understanding Van der Waals Constant 'a'
The van der Waals constant 'a' is a measure of the attraction between particles in a gas. A higher value of 'a' indicates stronger intermolecular forces.

**Hint:** Remember that 'a' reflects the strength of intermolecular attractions in a substance.

### Step 2: Comparing Ammonia and Nitrogen
Ammonia (NH₃) has a higher value of 'a' compared to nitrogen (N₂). This is because ammonia molecules can form hydrogen bonds due to the presence of nitrogen bonded to hydrogen, which is highly electronegative.

**Hint:** Consider the types of intermolecular forces present in each molecule.

### Step 3: Hydrogen Bonding in Ammonia
Ammonia exhibits significant hydrogen bonding due to the presence of hydrogen atoms bonded to a highly electronegative nitrogen atom. This results in stronger intermolecular forces compared to nitrogen, which primarily exhibits weak van der Waals forces.

**Hint:** Recall that hydrogen bonding is a specific type of strong dipole-dipole interaction.

### Step 4: Lack of Hydrogen Bonding in Nitrogen
Nitrogen (N₂) is a diatomic molecule with a triple bond between two nitrogen atoms. It does not have hydrogen atoms to form hydrogen bonds, resulting in a lower value of 'a' compared to ammonia.

**Hint:** Think about the molecular structure of nitrogen and its implications for intermolecular forces.

### Step 5: Conclusion on Statements
- **Statement 1**: The value of van der Waals constant 'a' is higher for ammonia than for nitrogen. This is **true**.
- **Statement 2**: Intermolecular hydrogen bonding is present in ammonia. This is also **true**.

Since Statement 2 correctly explains why Statement 1 is true, we conclude that both statements are correct, and Statement 2 is the correct explanation for Statement 1.

**Final Answer:** Both statements are correct, and Statement 2 is the correct explanation for Statement 1.