Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
If sufficient slot area is not provided, the gas may pass through the skirt clearance
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
None of these

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Give access to the individual trays for cleaning, maintenance and installation
Keep a check on the liquid gradient over the plate by direct visual observation
All of these
Guard against foaming & entrainment by dumping antifoaming agent through it

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