In fractional distillation, hydrocarbons with the __________ (highest/lowest) boiling points condense first.

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Solution

In fractional distillation, hydrocarbons with the lowest boiling points condense first.

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Q. Fill in the blanks with appropriate words selected from those given below.

heights, condense, lower, bitumen, hydrocarbons,
high, fractional distillation, cool, fractionating column,
diesel oil, petrol, refinery, higher up, lower down

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(b) Substances with _____________ boiling points condense first, in the column. Substances with ___________ boiling points condense ______________. Light products like ___________ are withdrawn from near the top of the column. Heavier products like ___________ and fuel oil are taken out lower down. The heaviest hydrocarbons, such as __________ are left at the bottom.

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Q. Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.

Q. During distillation, the liquid with a lower boiling point separates out before the liquid with a higher boiling point.

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