Q. In re-fluxing, the re-flux ratio needs to a minimum.

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Q. The feed line tells us that a particular feed A is at a sub-cooled liquid. Which of the following explains the above statement?

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Q. Statement 1: Bubble point means the feed is at saturated vapor.
Statement 2: Dew point means the feed is at boiling point.

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Q. When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
Statement 1: q<1 means the liquid is sub-cooled.
Statement 2: q<0 means the liquid is super heated vapor.

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Q. When q=(Heat required to convert one mole of feed to saturated vapor)/(Molar heat of vaporization of feed)
Statement 1: q<1 means the slope is a horizontal line.

Statement 2: q<1 means the slope is a vertical line.

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Q. With respect to ammonia-water system –
Statement 1: Limiting ratio is when the __(1)___ will meet __(2)__

Statement 2: When the flow rate of liquid is high, the distance between (1) and (2) decreases.

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Q. ∫yₒʸᵇdy/(y-y*) gives you _____

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Q. Statement 1: Hydrogenation of fats involves liquid-gas phases only.
Statement 2: Hydrogenation of fats is known as slurry reactor system.

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Q. Statement 1: Vapour-liquid-Equilibria is related to by a simple expression of Raoult’s law.
Statement 2: Raoult’s law is applicable to real gases.

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Q. Raoult’s law is when mole fraction approaches zero and Henry’s law is applicable when concentration approaches zero.

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Q. Ethanol-water mixture is a popular example of a mixture exhibiting the typical VLE curve.

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Q. Statement 1: Boiling point concentration diagram plots y against x. (Mole fraction in gas and liquid phase respectively).
Statement 2: VLE curve plots y against x. (Mole fraction in gas and liquid phase respectively).

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Q. Statement 1: Batch distillation is used for small capacity operations.
Statement 2: In food processing, batch distillation is used for desolventization.

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Q. When a system doesn’t obey Raoult’s law, the relative volatility is the ratio of the Henry’s constants for the two systems.

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Q. Liquid-liquid extraction is called leaching.

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Q. If extraction is done at the _____ of the solvent, it is called _____

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Q. Statement 1: Soya bean has a high oil content.
Statement 2: If the oil content is high, extraction is done by solvent extraction alone.

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Q. Oil seed cakes are obtained by _____

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Q. Statement 1: Partition coefficient pertains to solid-liquid extraction.
Statement 2: Leaching involves both heat and mass transfer.

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Q. Which among the following factors does NOT affect extraction?

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