Mark out the correct statement among the following.

Options

A. Aqueous `AgNO_(3)` solution can be stored in a copper bowl.
B. Aqueous `CuSO_(4)` solution can be stored in a silver bowl.
C. `Cu, Ag` can release hydrogen gas from dil HCl.
D. `H_(2)` cannot reduce `Cu^(2+) and Ag^(+)` in the form of metals.

Answer

To solve the question of identifying the correct statement among the given options, we will analyze each statement based on the standard reduction potentials of the metals involved.

### Step-by-Step Solution:

1. **Evaluate Statement 1: "Aqueous AgNO3 solution can be stored in a copper bowl."**
- **Analysis:**
- The standard reduction potential for copper (Cu) is +0.34 V, and for silver (Ag) it is +0.22 V.
- Since copper has a higher reduction potential than silver, it is more reactive. Therefore, if AgNO3 is stored in a copper bowl, copper will displace silver from the solution.
- **Conclusion:** This statement is incorrect.

2. **Evaluate Statement 2: "Aqueous copper sulphate solution can be stored in a silver wall."**
- **Analysis:**
- Since copper is more reactive than silver, silver cannot displace copper from copper sulfate solution.
- The standard reduction potential of copper is higher than that of silver, which supports that silver will not react with copper sulfate.
- **Conclusion:** This statement is correct.

3. **Evaluate Statement 3: "Copper can release hydrogen gas from dilute HCl."**
- **Analysis:**
- For a metal to displace hydrogen from HCl, it must have a lower standard reduction potential than hydrogen (0.00 V).
- Copper has a higher reduction potential (+0.34 V) than hydrogen, meaning it cannot displace hydrogen from HCl.
- **Conclusion:** This statement is incorrect.

4. **Evaluate Statement 4: "H2 cannot reduce Cu²⁺ and Ag⁺ to metal."**
- **Analysis:**
- Hydrogen has a standard reduction potential of 0.00 V, while both copper (+0.34 V) and silver (+0.22 V) have higher potentials.
- This means that hydrogen cannot reduce Cu²⁺ or Ag⁺ ions to their respective metals.
- **Conclusion:** This statement is also incorrect.

### Final Conclusion:
After evaluating all the statements, we find that **Statement 2** is the correct one: "Aqueous copper sulphate solution can be stored in a silver wall."

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