Quantitative estimatin of `C,H` and extra elements (e.g., N.S.P., and halogens) is carried out by Liebig's combustion, Carius, Dumas, and Kjeldahl's method.
Q. Carius method is used for the quantitative estimation of:

Options

A. C and H
B. Halogens, S, and P
C. N
D. all

Answer

To solve the question regarding the Carius method and its application in the quantitative estimation of elements, we will follow these steps:

### Step 1: Understand the Carius Method
The Carius method is a technique used for the quantitative estimation of certain elements in organic compounds. It involves the oxidation of the organic compound to determine the amounts of specific elements.

**Hint:** Familiarize yourself with the basic principles of the Carius method and its purpose in analytical chemistry.

### Step 2: Identify Elements Estimated by the Carius Method
The Carius method is specifically used for the determination of halogens (like chlorine, bromine, iodine), sulfur, and phosphorus in organic compounds.

**Hint:** Recall the types of elements that are commonly analyzed in organic chemistry and their significance.

### Step 3: Describe the Procedure
In the Carius method, a known mass of the organic compound is heated with fuming nitric acid in the presence of silver nitrate. The reaction leads to the formation of carbon dioxide and water from carbon and hydrogen, while halogens are converted to their corresponding silver halides.

**Hint:** Consider the role of each reagent in the reaction and how they contribute to the analysis of the organic compound.

### Step 4: Analyze the Results
After the reaction, the resulting products are filtered, washed, dried, and weighed. This allows for the quantitative estimation of the elements present in the original compound.

**Hint:** Think about how the final weights of the products relate to the amounts of the original elements in the compound.

### Conclusion
The Carius method is primarily used for the quantitative estimation of halogens, sulfur, and phosphorus in organic compounds.

**Final Answer:** The Carius method is used for the quantitative estimation of halogens, sulfur, and phosphorus.