A mixture on heating gave a gas used as an anaesthetic soluble in water forming cis , and trans dibasic acid `1.1 g` of gas occupes `0.56L` at `STP` mixture contain

Options

A. `NaNO_(3) + NH_(4)CI`
B. `NaNO_(2) + NH_(4)CI`
C. `CaCO_(3) + MgCO_(3)`
D. `NH_(4)CI+ NaSO_(4)`

Answer

To solve the problem step by step, we will analyze the information provided and apply the relevant concepts from chemistry.

### Step-by-Step Solution

1. **Identify the Gas Produced**:
The problem states that the gas produced upon heating is used as an anesthetic and is soluble in water. The gas also forms cis and trans dibasic acids. A common gas that fits these criteria is carbon dioxide (CO2).

2. **Calculate the Number of Moles of Gas**:
We are given that 1.1 g of gas occupies 0.56 L at STP (Standard Temperature and Pressure). At STP, 1 mole of gas occupies 22.4 L.
- To find the number of moles, we use the formula:
\[ \text{Number of moles} = \frac{\text{Volume of gas at STP}}{\text{Volume occupied by 1 mole at STP}} = \frac{0.56 \, \text{L}}{22.4 \, \text{L/mol}} = 0.025 \, \text{moles} \]

3. **Calculate the Molar Mass of the Gas**:
The molar mass can be calculated using the formula:
\[ \text{Molar mass} = \frac{\text{Mass of gas}}{\text{Number of moles}} = \frac{1.1 \, \text{g}}{0.025 \, \text{moles}} = 44 \, \text{g/mol} \]
This indicates that the gas is CO2, as the molar mass of CO2 is approximately 44 g/mol.

4. **Identify the Mixture**:
The problem provides four options for the mixture. We need to determine which of these mixtures can produce CO2 upon heating:
- **Option 1**: NaNO3 + NH4Cl
- **Option 2**: NaNO2 + NH4Cl
- **Option 3**: CaCO3 + MgCO3
- **Option 4**: NH4Cl + NaSO4

We know that calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) decompose upon heating to produce CO2:
- \( \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \)
- \( \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 \)

Therefore, the correct option that produces CO2 is **Option 3: CaCO3 + MgCO3**.

5. **Conclusion**:
The mixture that produces the gas (CO2) upon heating is **CaCO3 + MgCO3**.

### Final Answer
The mixture contains **CaCO3 and MgCO3** (Option 3).