Assertion : Solution of `Na_(2) CrO_(4)` in water is intensely coloured
Reason : Oxidation state of `Cr` in `Na_(2) CrO_(4)` is `+ VI`.

Options

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

Explanation

To solve the assertion and reason question regarding sodium chromate (Na₂CrO₄), we need to analyze both statements provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the solution of Na₂CrO₄ in water is intensely colored.
- Sodium chromate is known to have a pale yellow color in solution.

2. **Understanding the Reason**:
- The reason provided states that the oxidation state of chromium (Cr) in Na₂CrO₄ is +6.
- To verify this, we can calculate the oxidation state of chromium in Na₂CrO₄.
- Sodium (Na) has an oxidation state of +1.
- Oxygen (O) has an oxidation state of -2.
- The formula for sodium chromate can be expressed as:
\[ 2(+1) + X + 4(-2) = 0 \]
where X is the oxidation state of chromium.
- This simplifies to:
\[ 2 + X - 8 = 0 \implies X = +6 \]
- Therefore, the oxidation state of chromium in Na₂CrO₄ is indeed +6.

3. **Connecting the Assertion and Reason**:
- The pale yellow color of the Na₂CrO₄ solution is due to electronic transitions within the chromium ion, specifically due to d-d transitions or charge transfer processes.
- While the reason correctly identifies the oxidation state of chromium, it does not fully explain why the solution is colored. The color arises from electronic transitions, which are not mentioned in the reason.

4. **Conclusion**:
- Both the assertion and the reason are correct, but the reason does not adequately explain the assertion.
- Therefore, the correct answer to the question is that the assertion is true, the reason is true, but the reason does not explain the assertion.

### Final Answer:
- The assertion is true, the reason is true, but the reason does not explain the assertion correctly.