Among `Na,Hg,S,Pt` and graphite which can be used as electodes in electrolytic cell having aqueous solutions?

Options

A. `Na` and `S`
B. `Hg,pT` and `S`
C. `Na,Hg,` and `S`
D. `Hg,Pt,` and graphite

Explanation

To determine which of the elements (Na, Hg, S, Pt, and graphite) can be used as electrodes in an electrolytic cell with aqueous solutions, we need to consider the reactivity of these elements with water. Here's a step-by-step solution:

### Step 1: Analyze the Reactivity of Each Element
- **Sodium (Na)**: Sodium is highly reactive with water. It reacts vigorously to produce sodium hydroxide (NaOH) and hydrogen gas (H2). This means sodium cannot be used as an electrode in an aqueous solution because it will react and deteriorate.

- **Mercury (Hg)**: Mercury is relatively unreactive with water. It does not react with water under normal conditions, making it a suitable candidate for use as an electrode in aqueous solutions.

- **Sulfur (S)**: Sulfur can react with water under certain conditions to produce hydrogen sulfide (H2S) and sulfur dioxide (SO2). Therefore, sulfur is not suitable as an electrode in an aqueous solution.

- **Platinum (Pt)**: Platinum is a noble metal and is highly unreactive. It does not react with water and is often used as an electrode material in various electrochemical cells.

- **Graphite**: Graphite is also unreactive in aqueous solutions and is commonly used as an electrode material due to its good conductivity and stability.

### Step 2: Conclusion
From the analysis, the elements that can be used as electrodes in an electrolytic cell with aqueous solutions are:
- Mercury (Hg)
- Platinum (Pt)
- Graphite

Therefore, the correct answer is **Hg, Pt, and graphite**.

### Final Answer:
The elements that can be used as electrodes in an electrolytic cell having aqueous solutions are **Hg (mercury), Pt (platinum), and graphite**.

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