Mass Transfer
Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?

Bubble cap column
Wetted wall column
Randomly packed column
Sieve plate column

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Mass Transfer
Inside the distillation column, the

Pressure increases gradually from bottom to the top of the column
Liquids are not always at their bubble points
Driving force for the vapour flow is the pressure drop
None of these

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