Aqua regia reacts with Pt to yeild:

Options

A. `Pt(NO_(3))_(4)`
B. `H_(2)PtCl_(6)`
C. `PtCl_(4)`
D. `PtCl_(2)`

Answer

To solve the question regarding the reaction of aqua regia with platinum, we can follow these steps:

### Step 1: Understand Aqua Regia
Aqua regia is a highly corrosive mixture of two acids: nitric acid (HNO3) and hydrochloric acid (HCl) in a molar ratio of 1:3. It is known for its ability to dissolve noble metals, including gold and platinum.

**Hint:** Remember that aqua regia is specifically used to dissolve noble metals.

### Step 2: Identify the Reaction
When aqua regia comes into contact with platinum (Pt), it initiates a chemical reaction. The platinum reacts with nitric acid and hydrochloric acid to form a complex compound.

**Hint:** Focus on the components of aqua regia and how they interact with platinum.

### Step 3: Write the Initial Reaction
The initial reaction can be represented as:
\[ \text{Pt} + \text{HNO}_3 + \text{HCl} \rightarrow \text{NO} + \text{PtCl}_4 + \text{H}_2\text{O} + \text{O}_2 \]
This reaction produces nitrosoplatinic chloride (NO) and water, along with oxygen gas.

**Hint:** Look for the products formed in the reaction and note the formation of gases and other compounds.

### Step 4: Further Reaction with HCl
The product formed, nitrosoplatinic chloride, can further react with hydrochloric acid (HCl) to yield:
\[ \text{NO} + \text{HCl} \rightarrow \text{H}_2\text{PtCl}_6 \]
This compound is known as chloroplatinous acid.

**Hint:** Consider how the initial product interacts with additional HCl to form a more complex compound.

### Step 5: Final Product
The final product of the reaction between aqua regia and platinum is chloroplatinous acid, represented as \( \text{H}_2\text{PtCl}_6 \).

**Hint:** Identify the final compound that results from the complete reaction process.

### Conclusion
The reaction of aqua regia with platinum yields chloroplatinous acid, \( \text{H}_2\text{PtCl}_6 \).

**Final Answer:** The product formed when aqua regia reacts with platinum is \( \text{H}_2\text{PtCl}_6 \) (chloroplatinous acid).