If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.

ANS:B - > 100

In distillation columns, Murphree efficiency is a measure of how closely the actual vapor flow approaches the ideal vapor flow. It's calculated as the ratio of actual vapor flow to the ideal vapor flow. When the path of liquid across the plate is very long, it can lead to an increase in the actual vapor flow compared to what would be expected in an ideal scenario. As a result, the Murphree efficiency can exceed 100 percent, indicating that the actual vapor flow is greater than what would be theoretically expected for optimal operation. This situation often occurs in large diameter towers where the liquid has a longer path to travel, allowing for more vapor to be carried along, thus leading to a Murphree efficiency greater than 100 percent.