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

Sulphuric acid
Hydrochloric acid
Alkalis
Nitric acid

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Actual humidity to saturation humidity
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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