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, we need to analyze each of the given statements regarding the reactivity of metals and their ability to displace each other based on their standard reduction potentials.

### Step-by-Step Solution

1. **Evaluate Option 1: Aqueous AgNO3 solution can be stored in a copper bowl.**
- The standard reduction potential for silver (Ag) is approximately +0.8 V, while for copper (Cu) it is about +0.34 V.
- Since silver has a higher reduction potential than copper, it means that silver is less reactive than copper.
- If AgNO3 is stored in a copper bowl, copper can displace silver from the solution, leading to the formation of copper nitrate (Cu(NO3)2) and solid silver (Ag).
- Therefore, this statement is **incorrect**.

2. **Evaluate Option 2: Aqueous copper sulfate can be stored in a silver bowl.**
- The reduction potential of copper (Cu) is +0.34 V, and that of silver (Ag) is +0.8 V.
- Since silver has a higher reduction potential than copper, it means that silver is less reactive than copper.
- In this case, silver cannot displace copper from copper sulfate (CuSO4) solution because copper is more reactive.
- Thus, storing copper sulfate in a silver bowl is **correct**.

3. **Evaluate Option 3: Copper and silver can release hydrogen gas from dilute HCl.**
- The reduction potential for hydrogen (H2) is 0 V.
- Both copper (+0.34 V) and silver (+0.8 V) have higher reduction potentials than hydrogen.
- Therefore, neither copper nor silver can displace hydrogen from dilute HCl, meaning they will not release hydrogen gas.
- This statement is **incorrect**.

4. **Evaluate Option 4: H2 cannot reduce Cu2 and Ag2 in the form of metals.**
- Since hydrogen has a lower reduction potential than both copper and silver, it cannot reduce these metals from their ionic forms (Cu^2+ and Ag^+).
- Therefore, this statement is also **correct**. However, it is important to note that the statement claims "H2 cannot reduce Cu2 and Hg2," which is misleading because it suggests a broader context without specifying the conditions.

### Conclusion
The correct statement among the options is **Option 2**: Aqueous copper sulfate can be stored in a silver bowl.