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 is the name of:

Options

A. A chemist
B. A biologist
C. A sealed capillary tube
D. A long necked round bottom flask

Answer

To answer the question regarding what "Carius" refers to in the context of quantitative estimation methods in chemistry, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what "Carius" refers to among the given options: a chemist, a biologist, a sealed capillary tube, or a long-necked round-bottom flask.

2. **Identifying Carius's Contribution**: Carius is associated with a specific method used in the quantitative analysis of organic compounds. This method involves the use of a particular type of apparatus.

3. **Recognizing the Apparatus Used**: In the Carius method, an iron tube is utilized, which is often referred to as the "Carius tube." This tube is designed to withstand high temperatures and is used for the combustion of organic compounds to determine their elemental composition.

4. **Selecting the Correct Option**: Given that the Carius method involves a sealed capillary tube (the Carius tube), we can conclude that the correct answer to the question is "a sealed capillary tube."

5. **Final Answer**: Therefore, the answer to the question is: Carius is the name of a sealed capillary tube.