Chromyl chloride when dissolves in NaOH solution gives yellow solution. The yellow solution contains

Options

A. `Cr_(2)O_(7)^(2-)`
B. `Cr_(4)^(2-)`
C. `CrO_(5)`
D. `2//3`

Answer

To solve the question regarding the yellow solution formed when chromyl chloride (CrO2Cl2) is dissolved in sodium hydroxide (NaOH), we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this case are chromyl chloride (CrO2Cl2) and sodium hydroxide (NaOH).

2. **Write the Reaction**:
- When chromyl chloride reacts with sodium hydroxide, the reaction can be represented as:
\[ \text{CrO}_2\text{Cl}_2 + \text{NaOH} \rightarrow \text{Na}_2\text{CrO}_4 + \text{NaCl} + \text{H}_2\text{O} \]

3. **Balance the Reaction**:
- To balance the reaction, we need to ensure that the number of atoms of each element is the same on both sides. The balanced equation is:
\[ \text{CrO}_2\text{Cl}_2 + 4 \text{NaOH} \rightarrow \text{Na}_2\text{CrO}_4 + 2 \text{NaCl} + 2 \text{H}_2\text{O} \]

4. **Identify the Product**:
- The product that is formed in the reaction is sodium chromate (Na2CrO4), which is known to give a yellow solution.

5. **Determine the Yellow Solution's Composition**:
- The yellow solution contains the chromate ion (CrO4^2-), which is responsible for the yellow color.

6. **Identify the Oxidation State**:
- In sodium chromate, chromium is in the +6 oxidation state.

### Conclusion:
The yellow solution formed when chromyl chloride is dissolved in NaOH contains the chromate ion (CrO4^2-).

### Final Answer:
The yellow solution contains CrO4^2-.

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