Assertion :- Physical adsorption forms multimolecular layer.
Reason :- It contains covalent bond.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.

Answer

To analyze the given assertion and reason, we will break down the concepts of physical adsorption and chemical adsorption step by step.

### Step 1: Understanding Physical Adsorption
**Explanation:** Physical adsorption, also known as physisorption, occurs when molecules adhere to a surface through weak van der Waals forces. This process is generally reversible and does not involve any significant changes to the electronic structure of the adsorbate or the adsorbent.

**Hint:** Remember that physical adsorption involves weak interactions and is reversible.

### Step 2: Formation of Multimolecular Layers
**Explanation:** In physical adsorption, the adsorbate can form multiple layers on the adsorbent surface due to the weak van der Waals forces. As more molecules attach to the surface, they can stack on top of each other, leading to the formation of multimolecular layers.

**Hint:** Think about how layers can build up when the forces of attraction are weak and reversible.

### Step 3: Understanding Chemical Adsorption
**Explanation:** Chemical adsorption, or chemisorption, involves the formation of strong chemical bonds (often covalent) between the adsorbate and the adsorbent. This process is usually irreversible because it involves a significant rearrangement of the electronic structure.

**Hint:** Recall that chemical adsorption involves stronger bonds compared to physical adsorption.

### Step 4: Analyzing the Assertion
**Assertion:** "Physical adsorption forms multimolecular layers."
- **Evaluation:** This statement is true. Physical adsorption allows for the formation of multiple layers due to weak van der Waals forces.

**Hint:** Focus on the nature of the forces involved in physical adsorption.

### Step 5: Analyzing the Reason
**Reason:** "It contains covalent bond."
- **Evaluation:** This statement is false. Physical adsorption does not involve covalent bonds; it relies on weak van der Waals forces. Covalent bonds are characteristic of chemical adsorption.

**Hint:** Distinguish between the types of bonds formed in physical and chemical adsorption.

### Conclusion
- **Final Evaluation:** The assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true, and the reason is false.

**Final Answer:** Assertion is true, Reason is false.