Each question contain statement-1 (Assertion) and statement-2 (Reason) Examine the statements carefully and work the correct answer according to the instruction given below :
Statement - 1 : `CaCO_(3) rarr CaO + CO_(2)` is not redox reaction.
Statement - 2 : C, Ca, O do not change their oxidation number in the reaction.

Options

A. If both the statements are True and Statement-2 is the correct explanation of the statement-1
B. If both the statements are True and statement-2 is not the correct explanation of statement-1
C. If statement-1 is true and statement-2 is False.
D. If statement-1 is false and statement-2 is True.

Answer

To determine whether the statements are correct and if the reason provided is a valid explanation for the assertion, we will analyze the reaction step by step.

**Step 1: Identify the Reaction**
The reaction given is:
\[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \]

**Step 2: Determine the Oxidation States**
We need to assign oxidation states to each element in the reactants and products.

1. **In Calcium Carbonate (CaCO₃)**:
- Calcium (Ca) has an oxidation state of +2.
- Oxygen (O) has an oxidation state of -2 (there are 3 oxygen atoms, so total = -6).
- Let the oxidation state of Carbon (C) be \( x \).
- The overall charge of the carbonate ion (CO₃²⁻) is -2.
- Therefore, we can set up the equation:
\[ +2 + x + (-6) = -2 \implies x - 4 = -2 \implies x = +4 \]
- So, in CaCO₃, the oxidation states are:
- Ca: +2
- C: +4
- O: -2

2. **In Calcium Oxide (CaO)**:
- Calcium (Ca) remains +2.
- Oxygen (O) is -2.
- Therefore, the oxidation states are:
- Ca: +2
- O: -2

3. **In Carbon Dioxide (CO₂)**:
- Let the oxidation state of Carbon (C) again be \( x \).
- The two oxygen atoms contribute -4 (2 * -2).
- The overall charge is neutral (0):
\[ x + (-4) = 0 \implies x = +4 \]
- Thus, in CO₂, the oxidation states are:
- C: +4
- O: -2

**Step 3: Compare Oxidation States**
Now we compare the oxidation states before and after the reaction:
- In CaCO₃:
- Ca: +2, C: +4, O: -2
- In CaO:
- Ca: +2, O: -2
- In CO₂:
- C: +4, O: -2

**Step 4: Conclusion on Redox Reaction**
Since the oxidation states of all elements (Ca, C, and O) do not change during the reaction, there is no oxidation or reduction occurring. Therefore, this reaction is not a redox reaction.

**Step 5: Evaluate the Statements**
- **Statement 1 (Assertion)**: "CaCO₃ → CaO + CO₂ is not a redox reaction." - This is **true**.
- **Statement 2 (Reason)**: "C, Ca, O do not change their oxidation number in the reaction." - This is also **true**.

Since both statements are true and the reason correctly explains the assertion, we conclude that:

**Final Answer**: Both statements are correct, and Statement 2 is the correct explanation of Statement 1.

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