If molecular weight of compound is increased then sensitivity is decreased in which of the following methods

Options

A. Elevation in boiling point
B. Viscosity
C. Osmosis
D. Dialysis

Explanation

To solve the question regarding the effect of increasing molecular weight on sensitivity in different methods, we can follow these steps:

### Step 1: Understand the question
The question asks about the relationship between the molecular weight of a compound and its sensitivity in various methods. Sensitivity here refers to how responsive a method is to changes in concentration or presence of a solute.

### Step 2: Identify the methods mentioned
The methods that are typically considered in this context include:
- Elevation in boiling point
- Depression in freezing point
- Dialysis

### Step 3: Analyze the effect of molecular weight on each method
1. **Elevation in Boiling Point**: This method is based on colligative properties, which depend on the number of solute particles in a solution rather than their molecular weight. Therefore, increasing the molecular weight of the solute does not significantly affect the sensitivity of this method.

2. **Depression in Freezing Point**: Similar to boiling point elevation, this method is also a colligative property. The sensitivity remains largely unchanged with an increase in molecular weight.

3. **Dialysis**: This method involves the separation of solutes based on their size. As the molecular weight of the solute increases, the ability of the solute to pass through the dialysis membrane decreases. Thus, sensitivity decreases with an increase in molecular weight.

### Step 4: Conclusion
Based on the analysis, the method where sensitivity decreases with an increase in molecular weight is **dialysis**. Therefore, the correct option is the one that corresponds to dialysis.

### Final Answer:
The correct option is **dialysis**.

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