Assertion: Equivalent weight of `FeC_(2)O_(4)` in the reaction, `FeC_(2)O_(4)+` Oxidising agent `rarr Fe^(3+)+CO_(2)` is `M//3`, where `M` is molar mass of `FeC_(2)O_(4)`.
Reason: In theabove reaction, total two mole of electrons are given up by `1 mol e` of `FeC_(2)O_(4)` to the oxidising agent.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explantion of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

To solve the problem, we need to analyze the assertion and the reason provided in the question regarding the equivalent weight of `FeC2O4` in the given redox reaction.

### Step-by-Step Solution:

1. **Identify the Reaction**:
The reaction given is:
\[ \text{FeC}_2\text{O}_4 + \text{Oxidizing agent} \rightarrow \text{Fe}^{3+} + \text{CO}_2 \]

2. **Determine the Oxidation States**:
- In `FeC2O4`, iron (Fe) is in the +2 oxidation state (Fe²⁺).
- The `C2O4` part (oxalate ion) contains carbon in the +3 oxidation state (each carbon in C2O4 is +3) and the overall charge is -2.

3. **Identify the Changes in Oxidation States**:
- Iron (Fe) is oxidized from +2 to +3, losing 1 electron.
- The oxalate ion (C2O4²⁻) is oxidized to carbon dioxide (CO2), where each carbon is in the +4 oxidation state, resulting in the loss of 2 electrons.

4. **Calculate Total Electrons Lost**:
- Total electrons lost by `FeC2O4`:
- 1 electron from Fe (Fe²⁺ to Fe³⁺)
- 2 electrons from C2O4 (C2O4²⁻ to CO2)
- Therefore, total electrons lost = 1 + 2 = 3 electrons.

5. **Determine the Equivalent Weight**:
- The equivalent weight of a substance is given by the formula:
\[ \text{Equivalent weight} = \frac{\text{Molar mass}}{\text{n}} \]
where `n` is the number of moles of electrons transferred.
- Here, `n = 3` (as calculated above).
- Let `M` be the molar mass of `FeC2O4`. Thus, the equivalent weight is:
\[ \text{Equivalent weight of FeC}_2\text{O}_4 = \frac{M}{3} \]

6. **Conclusion**:
- The assertion that the equivalent weight of `FeC2O4` in the reaction is `M/3` is **correct**.
- The reason stating that "total two moles of electrons are given up by 1 mole of `FeC2O4`" is **incorrect** because we established that 3 moles of electrons are given up.

### Final Answer:
- Assertion: True
- Reason: False
- Therefore, the answer is that the assertion is true, but the reason is false.