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

Alkalis
Sulphuric acid
Nitric acid
Hydrochloric acid

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Mass Transfer
In saturated gas, the

None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature
Vapour is in equilibrium with the liquid at the room temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature

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