When intimate mixture of potassium dichromate and potassium chloride is heated with conc.`H_(2)SO_(4)` which of the following is produced in the form of red vapours ?

Options

A. `CrO_(3)`
B. `Cr_(2)O_(3)`
C. `CrO_(2)Cl_(2)`
D. `CrCl_(2)`

Answer

To solve the question regarding the reaction of potassium dichromate and potassium chloride with concentrated sulfuric acid, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Potassium dichromate (K₂Cr₂O₇)
- Potassium chloride (KCl)
- Concentrated sulfuric acid (H₂SO₄)

### Step 2: Write the Reaction
When potassium dichromate reacts with potassium chloride in the presence of concentrated sulfuric acid, the reaction can be represented as follows:

\[ K_2Cr_2O_7 + KCl + H_2SO_4 \rightarrow CrO_2Cl_2 + K_2SO_4 + H_2O \]

### Step 3: Identify the Product
From the reaction, the main product of interest is chromyl chloride, which is represented as CrO₂Cl₂. This compound is known to produce red vapors when formed.

### Step 4: Write the Balanced Equation
To ensure the reaction is balanced, we can write the balanced equation as follows:

\[ K_2Cr_2O_7 + 4KCl + 3H_2SO_4 \rightarrow 2CrO_2Cl_2 + 3K_2SO_4 + 3H_2O \]

### Step 5: Conclusion
The product that is produced in the form of red vapors is chromyl chloride (CrO₂Cl₂).

### Final Answer
When an intimate mixture of potassium dichromate and potassium chloride is heated with concentrated sulfuric acid, chromyl chloride (CrO₂Cl₂) is produced in the form of red vapors.

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