A solid mixture of AgCl ad `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` and produces:

Options

A. greenish yellow gas
B. colourless gas
C. red coloured gas
D. no gas

Answer

To solve the problem of what happens when a solid mixture of AgCl and K₂Cr₂O₇ is heated with concentrated H₂SO₄, we can follow these steps:

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

### Step 2: Understand the Reaction Type
This reaction is a double displacement reaction (also known as a metathesis reaction). In this type of reaction, the ions in the reactants exchange partners to form new compounds.

### Step 3: Write the Reaction
When AgCl reacts with K₂Cr₂O₇ in the presence of concentrated H₂SO₄, the following products are formed:
- Silver dichromate (Ag₂Cr₂O₇)
- Potassium chloride (KCl)

The balanced chemical equation for this reaction can be written as:
\[ 2 \text{AgCl} + \text{K}_2\text{Cr}_2\text{O}_7 + 4 \text{H}_2\text{SO}_4 \rightarrow \text{Ag}_2\text{Cr}_2\text{O}_7 + 2 \text{KCl} + 4 \text{HCl} + 2 \text{H}_2\text{O} \]

### Step 4: Analyze the Products
- **Silver dichromate (Ag₂Cr₂O₇)**: This is a solid that may appear as a red or orange compound.
- **Potassium chloride (KCl)**: This is a soluble salt that remains in the solution.
- **Hydrochloric acid (HCl)**: This is a gas that is released during the reaction.
- **Water (H₂O)**: This is also produced as a byproduct.

### Step 5: Conclusion
When a solid mixture of AgCl and K₂Cr₂O₇ is heated with concentrated H₂SO₄, the products formed include silver dichromate, potassium chloride, hydrochloric acid, and water. Notably, hydrochloric acid is released as a gas during the reaction.

### Final Answer
The reaction produces silver dichromate, potassium chloride, hydrochloric acid (gas), and water.

---