Assertion : Ionic compounds are usually soluble in water.
Reason : Ionic compounds dissolve in water because water has a high dielectric constant.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the assertion and reason provided in the question, let's break it down step by step.

### Step 1: Understanding the Assertion
The assertion states that "Ionic compounds are usually soluble in water." This is a true statement. Ionic compounds, such as sodium chloride (NaCl), dissociate into their respective ions when they come into contact with water, leading to their solubility.

**Hint:** Consider the nature of ionic compounds and their interaction with water.

### Step 2: Understanding the Reason
The reason given is "Ionic compounds dissolve in water because water has a high dielectric constant." This statement is also true. The dielectric constant of a substance is a measure of its ability to reduce the electrostatic forces between charged particles. Water has a high dielectric constant, which means it can weaken the attractive forces between the positive and negative ions in an ionic compound.

**Hint:** Think about how the properties of water affect ionic interactions.

### Step 3: Connecting Assertion and Reason
Now, we need to connect the assertion with the reason. The reason explains why ionic compounds are soluble in water. The high dielectric constant of water allows it to effectively reduce the electrostatic forces between the ions in the ionic compound, facilitating their separation and dissolution.

**Hint:** Reflect on how the properties of a solvent influence the solubility of solutes.

### Step 4: Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct conclusion is that both statements are true, and the reason is a valid explanation for the assertion.

**Final Answer:** Both the assertion and reason are true, and the reason is the correct explanation for the assertion.