A : A particle at the corner of CCP unit cell has `(1)/(8)th` of its contribution to the unit cell.
R : In any space lattice the corner of the unit cell is always shared by the eight unit cell.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the given question, we need to analyze the statements A and R regarding the contribution of particles at the corners of a CCP (Cubic Close-Packed) unit cell and the sharing of corner particles in a space lattice.

### Step-by-Step Solution:

1. **Understanding the Contribution of Corner Particles:**
- In a CCP unit cell, there are particles located at each corner of the cube.
- Each corner particle is shared among 8 adjacent unit cells. This means that only a fraction of each corner particle belongs to any one unit cell.

**Contribution Calculation:**
- Since there are 8 unit cells sharing one corner particle, the contribution of one corner particle to the unit cell is:
\[ \text{Contribution from one corner particle} = \frac{1}{8} \]

2. **Verifying Statement A:**
- Statement A claims that a particle at the corner of the CCP unit cell has a contribution of \( \frac{1}{8} \) to the unit cell.
- Based on our calculation, this statement is **True**.

3. **Understanding the Sharing of Corner Particles in Any Space Lattice:**
- Statement R states that in any space lattice, the corner of the unit cell is always shared by 8 unit cells.
- While this is true for cubic lattices (like CCP), it is not true for all types of lattices. For example, in a hexagonal lattice, a corner particle may be shared by only 3 unit cells.

4. **Verifying Statement R:**
- Since Statement R generalizes the sharing of corner particles to "any space lattice," it is **False**. The sharing depends on the type of lattice structure.

### Conclusion:
- Statement A is **True**.
- Statement R is **False**.