Liquids and Solids test 3

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A test from chapter 4 i.e Liquids and Solids of Chemistry part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

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

A) 100 C
B) 200 C
C) 98 C
D) 25 C

2. Distillation under very reduced pressure is called

A) fractional distillation
B) distillation
C) vacuum destructive distillation
D) destructive distillation

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

A) 760 torr
B) 100 torr
C) 1489 torr
D) 700 torr

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

A) molar heat of sublimation
B) heat of vaporization
C) latent heat of fusion
D) 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

A) ethanol is polar molecule but ethyl ethanoate is non–polar
B) ethanol is non polar molecule but ethyl ethanoate is polar
C) a hydrogen bond is formed between H–atom of the OH group in ethanol and O–atom of water molecule
D) 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

A) lower at high altitude
B) higher at high altitude
C) same at sea level and high altitudes
D) equal to atmospheric pressure

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

A) vacuum distillation
B) destructive distillation
C) distillation
D) vacuum destructive distillation

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

A) a molecule of methane has a greater mass
B) a molecule of methane has more electrons than a molecule of neon
C) the molecules of methane have stronger intermolecular forces than those of neon
D) 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

A) molar heat of vaporization
B) molar heat of fusion
C) latent heat of fusion
D) molar heat of sublimation

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

A) Chlorine
B) argon
C) phosphorous
D) silicon