organic lab 1 part 2

What is the boiling point of a liquid?

• Temperature at which liquid freezes

• Temperature at which liquid solidifies

• Temperature at which vapour pressure equals external pressure

• Temperature at which intermolecular forces disappear

Which type of distillation is used for purifying two liquids with a boiling point difference ≥ 50°C?

• Simple Distillation

• Fractional Distillation

• Vacuum Distillation

• Azeotropic Distillation

What is the purpose of boiling stones?

• To prevent evaporation

• To regulate heating and avoid bumping

• To increase the boiling point

• To cool the liquid

What component is distilled first during distillation?

• Non-volatile component

• High boiling point component

• Low boiling point component

• High vapour pressure component

What is the purpose of greasing the joints in the apparatus?

• To prevent vapour formation

• To avoid leakage and sticking

• To increase pressure

• To enhance cooling

Why is the water inlet placed at the bottom of the condenser?

• To fill the condenser fully for better cooling

• To prevent leakage

• To avoid overheating

• To improve vapour pressure

What is the purpose of a fractionating column in fractional distillation?

• To filter the impurities

• To condense vapours

• To separate components with different boiling points

• To regulate heat distribution

Boiling point is considered an intensive property because:

• It depends on the mass of the liquid

• It depends on the type and purity of the substance

• It depends on the pressure only

• It changes with temperature

What happens if the liquid is allowed to boil to dryness?

• It will purify better

• The apparatus might break

• It may cause overheating or burning

• Nothing significant

Which substance in fractional distillation condenses first?

• Low boiling point component

• High boiling point component

• Non-volatile impurities

• Pure solid