51. Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around __________ inches.
52. Pick out the wrong statement.
53. Large quantity of silica gel is normally dried in a __________ dryer.
54. Refractory bricks are usually dried in a __________ dryer.
55. Adsorption is an unit operation which generally involves __________ systems.
56. For absorbing a sparingly soluble gas in a liquid, the
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