Mass Transfer
Which of the following equipments is not used for gas dispersion?

Bubble cap tray towers
Perforated sieve tray towers
Agitated vessels
Spray towers

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality

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