Which one of the following statement is correct?

Options

A. The elements having large negative values of electron gain enthalpy generally act as strong oxidising agents.
B. The elements having low values of ionisation enthalpies act as strong reducing agents.
C. The formation of `S^(2-)(g)` from `S(g)` is an endothermic process.
D. All of these.

Explanation

To solve the question, we need to analyze each statement provided and determine which one is correct. Let's break it down step by step.

### Step 1: Analyze Statement A
**Statement A:** "The elements having large negative values of electron gain enthalpy generally act as a strong oxidizing agent."

- **Explanation:** Electron gain enthalpy refers to the energy change when an electron is added to a neutral atom. A large negative value indicates that the process is exothermic, meaning the atom readily accepts an electron. This property aligns with the definition of a strong oxidizing agent, which is an entity that can accept electrons easily. Therefore, this statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "The elements having low values of ionization enthalpies act as strong reducing agents."

- **Explanation:** Ionization enthalpy is the energy required to remove an electron from a neutral atom. A low ionization enthalpy means that the atom can easily lose an electron, indicating that it can be oxidized. Since reducing agents donate electrons to other species, elements that can easily lose electrons (low ionization enthalpy) act as strong reducing agents. Thus, this statement is also **correct**.

### Step 3: Analyze Statement C
**Statement C:** "The formation of S^2- gas from S gas is an endothermic process."

- **Explanation:** The formation of anions from neutral atoms can have varying enthalpy changes. For sulfur, the formation of the S^2- ion involves adding two electrons. The overall process of forming S^2- from S gas is indeed endothermic, as it requires energy to add two electrons. Therefore, this statement is also **correct**.

### Step 4: Conclusion
Since all three statements (A, B, and C) are correct, we conclude that the answer to the question is:

**Correct Answer:** D (All of the above statements are correct)

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