What is the reaction given below, called ?
`H_(2)O_((l)) + H_(2)O_((l)) hArr H_(3)O_((aq))^(+) + OH_((aq))^(-)`

Options

A. Hydrolysis of water
B. Hydration of water
C. Disproportionation of water
D. Auto - protolysis of water

Explanation

To solve the question regarding the reaction of water molecules, we can break it down into several steps:

### Step 1: Identify the Reaction
The given reaction is:
\[ H_2O_{(l)} + H_2O_{(l)} \rightleftharpoons H_3O^+_{(aq)} + OH^-_{(aq)} \]

### Step 2: Understand the Components
In this reaction:
- Two water molecules (H₂O) interact with each other.
- One water molecule donates a proton (H⁺) to another water molecule.

### Step 3: Recognize the Products
The products of this reaction are:
- A hydronium ion (H₃O⁺), which is formed when a water molecule gains a proton.
- A hydroxide ion (OH⁻), which is formed when a water molecule loses a proton.

### Step 4: Define the Type of Reaction
This type of reaction is characterized by the transfer of protons between molecules of the same species (in this case, water).

### Step 5: Name the Reaction
The reaction is called **autoprotolysis** or **self-ionization** of water. This term refers to the process where two molecules of the same substance (water) react to form ions through proton transfer.

### Final Answer
The reaction given is called **autoprotolysis of water**.

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