Which is incorrect for paper chromatography

Options

A. it is a part of partition chromatography
B. It is a stationary phase
C. `R_(f)` value decrease when rate of adsorption increase
D. None of these

Answer

To solve the question regarding which statement is incorrect for paper chromatography, we will analyze each option step-by-step:

### Step 1: Understand Paper Chromatography
Paper chromatography is a technique used to separate and analyze mixtures of substances. It involves two phases:
- **Stationary Phase**: The paper itself, which does not move.
- **Mobile Phase**: The solvent that moves through the paper, carrying the components of the mixture with it.

### Step 2: Analyze Each Statement
Now, let's analyze the statements provided in the question.

#### Statement A: "It is a part of partition chromatography."
- **Analysis**: This statement is correct. Paper chromatography is indeed a form of partition chromatography where the separation of components occurs based on their distribution between the stationary phase (paper) and the mobile phase (solvent).

#### Statement B: "It is the stationary phase."
- **Analysis**: This statement is misleading. The paper is the stationary phase, but the statement itself lacks clarity. If it implies that paper chromatography does not involve a mobile phase, then it would be incorrect. However, if it simply states that the paper is the stationary phase, it is correct. Therefore, we need to consider the context of the statement.

#### Statement C: "RF value decreases when the rate of adsorption increases."
- **Analysis**: This statement is correct. The Rf value (retention factor) is defined as the distance traveled by the substance divided by the distance traveled by the solvent front. If a substance has a high rate of adsorption to the stationary phase, it will travel less distance, resulting in a lower Rf value.

### Step 3: Identify the Incorrect Statement
From the analysis:
- Statement A is correct.
- Statement B can be interpreted as misleading depending on its context.
- Statement C is correct.

Thus, the most likely incorrect statement is **Statement B**, as it may imply that paper chromatography does not involve a mobile phase, which is essential for the process.

### Final Answer
The incorrect statement for paper chromatography is **B**.

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