Liquids and Solids Set 2

Results

#1. When external pressure is 23.7 torr boiling point of water is

100oC

200oC

98oC

25oC

#2. Distillation under very reduced pressure is called

fractional distillation

distillation

vacuum destructive distillation

destructive distillation

#3. Water may boil at 120oC when external pressure is

760 torr (b) (c) (d)

100 torr

1489 torr

700 torr

#4. Amount of heat absorbed when one mole of solid melts into liquid form at its melting point is called

molar heat of sublimation

heat of vaporization

latent heat of fusion

molar heat of fusion

#5. Ethanol is much more soluble in water than ethyl ethanuate which one of the following statement correctly account for this

ethanol is polar molecule but ethyl ethanoate is non–polar

ethanol is non polar molecule but ethyl ethanoate is polar

a hydrogen bond is formed between H–atom of the OH group in ethanol and O–atom of water molecule

a hydrogen bond is formed between the H–atom of the OH group in ethanol and hydrogen of the water molecule

#6. The boiling point of a liquid will be

lower at high altitude

higher at high altitude

same at sea level and high altitudes

equal to atmospheric pressure

#7. The process in which liquids can be made to boil at low temperature is called

vacuum distillation

destructive distillation

distillation

vacuum destructive distillation

#8. Why is the boiling point of methane greater than that of neon

a molecule of methane has a greater mass

a molecule of methane has more electrons than a molecule of neon

the molecules of methane have stronger intermolecular forces than those of neon

the molecule of methane is polar but that of neon is not

#9. The amount of heat required to vaporize one mole of a liquid at its boiling point is called

molar heat of vaporization

molar heat of fusion

latent heat of fusion

molar heat of sublimation

#10. Which of the elements in its crystalline form will have the lowest enthalpy change of vaporizations

Finish