Two liquids `A` and `B` boil at `130^(@)C` and `160^(@)C` , respectively. Which of the them has higher vapour pressure at `80^(@)C`.

Answer

To determine which of the two liquids, A or B, has a higher vapor pressure at 80°C, we can follow these steps:

### Step 1: Understand the relationship between boiling point and vapor pressure
- The boiling point of a liquid is the temperature at which its vapor pressure equals the atmospheric pressure.
- Generally, liquids with lower boiling points have higher vapor pressures at a given temperature compared to liquids with higher boiling points.

### Step 2: Identify the boiling points of the liquids
- Liquid A boils at 130°C.
- Liquid B boils at 160°C.

### Step 3: Compare the boiling points
- Since liquid A has a lower boiling point (130°C) compared to liquid B (160°C), it is expected to be more volatile.

### Step 4: Conclude about vapor pressures at 80°C
- At 80°C, liquid A will have a higher vapor pressure than liquid B because it is more volatile due to its lower boiling point.

### Final Answer
- Therefore, liquid A has a higher vapor pressure at 80°C than liquid B.