Mark the correct statement for viscosity .

Options

A. (a) Greater the viscosity , more slowly the liquid flows .
B. (b) Viscosity increases with increase in temperature .
C. (c) Hydrogen bonding and van der Waals forces decrease the viscosity .
D. (d) Viscosity is the measure of ease with which a liquid flows .

Explanation

To determine the correct statement regarding viscosity, let's analyze the concept of viscosity and each of the provided options step by step.

### Step 1: Understand Viscosity
Viscosity is defined as the measure of a fluid's resistance to flow. A liquid with high viscosity flows more slowly than a liquid with low viscosity.

### Step 2: Analyze the Options
1. **Option A**: "Greater the viscosity, more slowly the liquid flows."
- This statement is correct. Higher viscosity means greater resistance to flow, resulting in slower movement of the liquid.

2. **Option B**: "Viscosity increases with increase in temperature."
- This statement is incorrect. Generally, as temperature increases, the kinetic energy of the molecules increases, which allows them to overcome intermolecular forces more easily, leading to a decrease in viscosity.

3. **Option C**: "Hydrogen bonding and Van der Waals forces decrease the viscosity."
- This statement is also incorrect. Strong intermolecular forces, such as hydrogen bonding, increase viscosity because they create more resistance to flow.

4. **Option D**: "Viscosity is the measure of ease of liquid flow."
- This statement is incorrect. Viscosity measures the resistance to flow, not the ease of flow.

### Conclusion
The correct statement regarding viscosity is **Option A**: "Greater the viscosity, more slowly the liquid flows."