Assertion : `CrO_(3)` is an acid anhydride.
Reason: `CrO_(3)` is obtained as bright orange crystals by the reaction of `K_(2) Cr_(2) O_(7)` with cold concentrated `H_(2) SO_(4)`.

Options

A. Statement-1 is true , Statement-2 is true and Statement-2 is correct explanation for Statement-1
B. Statement-1 is true, Statement-2 is True and Statement-2 is Not correct explanation for statement-1
C. Statement-1 is true, Statement-2 is False
D. Statement-1 is False, Statement-2 is True

Explanation

To solve the question regarding the assertion and reason about `CrO3`, we will break it down step by step.

### Step 1: Analyze the Assertion
**Assertion:** `CrO3` is an acid anhydride.

- An acid anhydride is a compound that can form an acid when reacted with water, but does not contain water itself.
- When `CrO3` is added to water, it produces `H2CrO4` (chromic acid).

**Conclusion for Step 1:** Since `CrO3` reacts with water to form an acid, it qualifies as an acid anhydride. Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
**Reason:** `CrO3` is obtained as bright orange crystals by the reaction of `K2Cr2O7` with cold concentrated `H2SO4`.

- The reaction between potassium dichromate (`K2Cr2O7`) and concentrated sulfuric acid (`H2SO4`) produces `CrO3`, `KHSO4`, and water.
- The reaction can be represented as:
\[ K_2Cr_2O_7 + 2 H_2SO_4 \rightarrow 2 KHSO_4 + CrO_3 + H_2O \]
- `CrO3` is indeed obtained as bright orange crystals from this reaction.

**Conclusion for Step 2:** The reason is also **true**.

### Step 3: Determine the Relationship Between Assertion and Reason
- While both the assertion and reason are true, the reason does not explain why `CrO3` is classified as an acid anhydride. The classification is based on its ability to form an acid upon reaction with water, not on how it is obtained.

### Final Conclusion
- **Assertion:** True
- **Reason:** True
- The reason is not the correct explanation for the assertion.

### Answer
The correct option is: **Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.**

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