Assertion: `Li_(2)SO_(4)` do not form double salt like alum.
Reason: Atomic size of Li is too small

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 solve the question regarding the assertion and reason provided, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states that lithium sulfate (Li₂SO₄) does not form double salts like alum.

**Hint for Step 1:** Recall what double salts are and their general formula.

### Step 2: Define Double Salts
Double salts are compounds that consist of two different salts that crystallize together. A common example is alum, which has the general formula X·Al(SO₄)₂·12H₂O, where X is a monovalent cation (like K⁺ or NH₄⁺).

**Hint for Step 2:** Remember the structure and composition of alums.

### Step 3: Analyze the Reason
The reason given is that the atomic size of lithium is too small.

**Hint for Step 3:** Consider how atomic size affects the ability of elements to form certain types of compounds.

### Step 4: Relate Atomic Size to Double Salt Formation
Lithium, being the first alkali metal, has a very small atomic radius. This small size leads to unique properties and behavior, making it less compatible with forming double salts. In contrast, larger alkali metals like potassium can easily form double salts due to their larger ionic size.

**Hint for Step 4:** Think about how ionic size influences the stability and formation of compounds.

### Step 5: Conclusion
Both the assertion and reason are correct. The assertion that Li₂SO₄ does not form double salts like alum is true, and the reason that this is due to the small atomic size of lithium is also correct. Therefore, the reason provided accurately explains the assertion.

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

### Summary of the Solution
- **Assertion:** Li₂SO₄ does not form double salts like alum.
- **Reason:** The atomic size of lithium is too small.
- **Conclusion:** Both statements are correct, and the reason explains the assertion.