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1.2 to 3.8 cms is the value of the

downcomer liquid seal in case of a balanced tray design.
static submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm.).
skirt clearance for bubble caps.
all (a), (b) and (c).

Correct Answer: all (a), (b) and (c).

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