The following are some state ments regarding dissociation of lime stone according to the equation `CaCO_(3(s)) hArr CaO_((s)) + CO_(2(g)) : Delta `H = 110 kJ. The reaction is carried in a closed vessel.
A) The pressure of `CO_(2)` increases when temperature is inereased.
B) The pressure of `CO_(2)` inereases when temperature is deereased
C) The pressure of `CO_(2)` increases when amount of `CaCO_(3)` is decreased. The incorrect statements are .

Options

A. A and B
B. B and C
C. A and C
D. All A, B, C

Answer

To solve the problem regarding the dissociation of limestone (calcium carbonate) according to the equation:

\[ \text{CaCO}_{3(s)} \rightleftharpoons \text{CaO}_{(s)} + \text{CO}_{2(g)} \quad \Delta H = 110 \, \text{kJ} \]

we need to analyze the three statements provided:

### Step 1: Understand the Reaction
The reaction is an endothermic process, meaning it absorbs heat. According to Le Chatelier's principle, if we increase the temperature of an endothermic reaction, the equilibrium will shift to favor the products.

### Step 2: Analyze Statement A
**Statement A:** "The pressure of CO₂ increases when temperature is increased."

- Since the reaction is endothermic, increasing the temperature will shift the equilibrium to the right, producing more CO₂ gas. Therefore, this statement is **true**.

### Step 3: Analyze Statement B
**Statement B:** "The pressure of CO₂ increases when temperature is decreased."

- Decreasing the temperature will shift the equilibrium to the left (favoring the reactants). This means less CO₂ will be produced, resulting in a decrease in pressure. Therefore, this statement is **false**.

### Step 4: Analyze Statement C
**Statement C:** "The pressure of CO₂ increases when the amount of CaCO₃ is decreased."

- According to Le Chatelier's principle, if we decrease the amount of a reactant (CaCO₃ in this case), the equilibrium will shift to the left to produce more reactants, which means less CO₂ will be produced. Therefore, this statement is also **false**.

### Conclusion
The incorrect statements are **B and C**.

### Final Answer:
The incorrect statements are B and C.

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