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Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is: N + 2 = 6 log $$\left( {\frac{{{{\text{y}}_{{\text{in}}}}}}{{{{\text{y}}_{{\text{out}}}}}}} \right).$$
For 98% recovery of acetone, the number of trays required is/are

Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is: N + 2 = 6 log $$\left( {\frac{{{{\text{y}}_{{\text{in}}}}}}{{{{\text{y}}_{{\text{out}}}}}}} \right).$$
For 98% recovery of acetone, the number of trays required is/are Correct Answer 9

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Statements : All the bottles are boxes. All the boxes are bags. Some bags are trays.

Conclusions :
I. Some bottles are trays.
II. Some trays are boxes.
III. All the bottles are bags.
IV. Some trays are bags.
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