Mass Transfer
Raschig ring made of procelain cannot be used for treating concentrated

Nitric acid
Hydrochloric acid
Alkalis
Sulphuric acid

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Viscosity variation of the fluids may cause channeling/flooding
None of these
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high

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