Which statement is correct

Options

A. A solution of copper (II) sulphate can be stored in iron vessel.
B. An oxide layer on zinc vessel can be easily removed by washing with dilute HCl.
C. Molten `PbBr_(2)` is good conductor of electricity becauser it contain free ions.
D. In the reaction, `Li + H_(2)`, LiH, hydrogen is a reducing agent.

Explanation

To determine which statement is correct, we will analyze each statement one by one based on the principles of electrochemistry.

### Step 1: Analyze the first statement regarding copper sulfate in an iron vessel.
- **Statement**: If you have taken a solution of copper sulfate and stored it in an iron vessel, then this is completely wrong.
- **Analysis**: This statement is false. According to the reactivity series, iron (Fe) is more reactive than copper (Cu). When copper sulfate (CuSO4) is stored in an iron vessel, a displacement reaction occurs where iron displaces copper from copper sulfate. The reaction can be represented as:
\[ \text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu} \]
The blue color of the copper sulfate solution will fade as copper is displaced and iron(II) sulfate (FeSO4) is formed.

### Step 2: Analyze the second statement regarding molten PBr2.
- **Statement**: Molten PBr2 is a good conductor of electricity because it contains 3 ions.
- **Analysis**: This statement is true. In the molten state, PBr2 dissociates into ions: PBr2 can produce PBr2^+ (phosphorus cation) and 2Br^- (bromide anions). The presence of free-moving ions in the molten state allows it to conduct electricity effectively. Therefore, this statement is correct.

### Step 3: Analyze the third statement regarding the reaction of Li and H2.
- **Statement**: When we did the reaction of Li plus H2, it forms LiH in which hydrogen acts like a reducing agent.
- **Analysis**: This statement is false. In the reaction between lithium (Li) and hydrogen (H2) to form lithium hydride (LiH), lithium is oxidized (loses electrons) and hydrogen is reduced (gains electrons). Hydrogen is not acting as a reducing agent; rather, it is acting as an oxidizing agent because it is being reduced from an oxidation state of 0 in H2 to -1 in LiH. Therefore, this statement is incorrect.

### Conclusion:
The correct statement among the three provided is the second statement regarding molten PBr2 being a good conductor of electricity.