`H_(2)SO_(4)` has very high corrosive action on skin because

Options

A. it reacts with `CaCO_(3)`
B. it acts as an reducing agent
C. it acts as a dehydrating agent
D. it acts as a dehydrating agent and absorption of water is highly exothermic

Explanation

To understand why sulfuric acid (H₂SO₄) has a very high corrosive action on skin, we can break down the explanation into several steps:

### Step 1: Nature of Sulfuric Acid
Sulfuric acid is a strong acid and a powerful dehydrating agent. It is known for its ability to absorb water from its surroundings.

**Hint:** Consider the properties of sulfuric acid that contribute to its corrosive nature.

### Step 2: Interaction with Skin
When sulfuric acid comes into contact with skin, it begins to absorb moisture (water) from the skin cells. This process leads to dehydration of the skin.

**Hint:** Think about what happens to skin when it loses moisture.

### Step 3: Exothermic Reaction
The absorption of water by sulfuric acid is an exothermic reaction, meaning it releases a significant amount of heat. This heat can cause further damage to the skin tissues.

**Hint:** Recall the definition of an exothermic reaction and how it affects the surrounding environment.

### Step 4: Resulting Damage
The combination of dehydration and the heat generated from the exothermic reaction results in severe damage to the skin, leading to burns and corrosion.

**Hint:** Consider the physical effects on skin when exposed to high temperatures and dehydration.

### Conclusion
Thus, the high corrosive action of sulfuric acid on skin is primarily due to its ability to absorb water, causing dehydration, and the heat released during this process.

**Final Answer:** Sulfuric acid acts as a dehydrating agent because it absorbs water from the skin, and this absorption is highly exothermic, leading to severe skin damage.