Mass Transfer
Smoke is an example of

Solid dispersed in gas
Liquid dispersed in gas
Solid dispersed in liquid
Gas dispersed in liquid

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Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

1000
1500
2000
2500

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Total pressure is less
Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Saturated steam is used for steam distillation

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