The correct statement (s) is/are with respect to chromy chloride test

Options

A. Formation of lead chromate
B. Formation of chromyl chloride chromate
C. Liberation of chloride
D. Formation of reddish -brown vapours

Answer

To solve the question regarding the correct statements about the chromyl chloride test, we will break down the information provided in the video transcript into a step-by-step solution.

### Step-by-Step Solution:

1. **Understanding Chromyl Chloride Test**:
- The chromyl chloride test involves the reaction of potassium dichromate (K2Cr2O7) with concentrated sulfuric acid (H2SO4) in the presence of sodium chloride (NaCl).

2. **Reaction Process**:
- When K2Cr2O7 is treated with H2SO4 and NaCl, chromyl chloride (CrO2Cl2) is formed. This compound is characterized by its red vapors.
- The balanced reaction can be represented as:
\[ K_2Cr_2O_7 + 4H_2SO_4 + 6NaCl \rightarrow 2CrO_2Cl_2 + 2KHSO_4 + 6NaHSO_4 + 2H_2O \]

3. **Observation of Red Vapors**:
- The formation of red vapors of chromyl chloride (CrO2Cl2) is a key observation in this test. This indicates that the test is positive for chloride ions.

4. **Hydrolysis of Chromyl Chloride**:
- When the red vapors of chromyl chloride are passed through water, they hydrolyze to form chromic acid (H2CrO4), which appears as a yellow solution.
- The reaction can be summarized as:
\[ CrO_2Cl_2 + 2H_2O \rightarrow H_2CrO_4 + 2HCl \]

5. **Conclusion on Correct Statements**:
- Based on the information, the correct statements regarding the chromyl chloride test are:
- Chromyl chloride forms red vapors.
- The test can be used to detect chloride ions.

### Final Answer:
The correct statements regarding the chromyl chloride test are:
- Chromyl chloride produces red vapors.
- The test is used for the detection of chloride ions.