A: One faraday electricity deposite 1 mole of Na & 2 mole of Cu in NaCl & `CuSO_(4)` solution respectively.
R: One faraday electricity always deposite 1 mole of any substance.

Options

A. f both Assertion & Reason are true and reason is the correct explanation of the assertion, then mark (2)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided in the statement.

### Step 1: Analyze the Assertion (A)
The assertion states that "One faraday electricity deposits 1 mole of Na and 2 moles of Cu in NaCl and CuSO4 solution respectively."

1. **For Sodium (Na) in NaCl:**
- In NaCl, sodium ions (Na⁺) are reduced at the cathode during electrolysis.
- The half-reaction for sodium is:
\[ \text{Na}^+ + e^- \rightarrow \text{Na} \]
- This means that 1 mole of sodium requires 1 mole of electrons (1 Faraday) to deposit 1 mole of Na.

2. **For Copper (Cu) in CuSO4:**
- In CuSO4, copper ions (Cu²⁺) are reduced at the cathode.
- The half-reaction for copper is:
\[ \text{Cu}^{2+} + 2e^- \rightarrow \text{Cu} \]
- This means that 1 mole of copper requires 2 moles of electrons (2 Faradays) to deposit 1 mole of Cu. Therefore, 1 Faraday will deposit only 0.5 moles of copper.

**Conclusion for Assertion (A):**
- The assertion is **false** because it incorrectly states that 1 Faraday deposits 2 moles of copper; it actually deposits only 0.5 moles.

### Step 2: Analyze the Reason (R)
The reason states that "One faraday electricity always deposits 1 mole of any substance."

- This statement is also **false**. The amount of substance deposited by 1 Faraday depends on the number of electrons required for the reduction of that substance. For example, as shown above, 1 Faraday deposits 1 mole of Na but only 0.5 moles of Cu.

### Step 3: Conclusion
Both the assertion and the reason are false. Therefore, the correct answer is that both A and R are false.

### Final Answer:
The correct option is **Option 4: Both assertion and reason are false.**

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