Euchlorine is

Options

A. obtained by heating perchlorate with conc. `HCl`
B. a chloride europium
C. a mixture of `Cl_(2) and Cl_(2)O_(7)`
D. a micture of `Cl_(2) and ClO_(2)`

Answer

To solve the question "What is Euchlorine?", we can follow these steps:

### Step 1: Understand the Definition
Euchlorine is a term used to describe a specific chemical mixture. It is important to identify the components that make up this mixture.

**Hint:** Look for the chemical compounds associated with the term "Euchlorine."

### Step 2: Identify the Chemical Reaction
Euchlorine is produced from the reaction of potassium chlorate (KClO3) with concentrated hydrochloric acid (HCl). The reaction can be represented as follows:

\[ \text{KClO}_3 + \text{HCl} \rightarrow \text{KCl} + \text{Cl}_2 + \text{ClO}_2 + \text{H}_2 \]

**Hint:** Focus on the reactants and products of the reaction to understand what is formed.

### Step 3: Analyze the Products
From the balanced reaction, we can see that the products include chlorine gas (Cl2) and chlorine dioxide (ClO2). These two components are significant in defining Euchlorine.

**Hint:** Pay attention to the specific products that are formed in the reaction.

### Step 4: Determine the Correct Option
Now, we need to evaluate the given options based on our understanding:
1. Obtained by heating perchlorate with concentrated hydrochloric acid - **Incorrect**
2. Chloride of europium - **Incorrect**
3. Mixture of Cl2 and ClO2 - **Incorrect**
4. Mixture of Cl2 and ClO2 - **Correct**

**Hint:** Compare the options with the identified components of Euchlorine.

### Conclusion
Euchlorine is defined as a mixture of chlorine gas (Cl2) and chlorine dioxide (ClO2). Therefore, the correct answer is the fourth option.

**Final Answer:** Option 4: Mixture of Cl2 and ClO2.