Question # 1

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

In order to mention the oiling point of water at 110 ^oC, the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

Which has greater enthalpy of vaporization

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F2

Cl2

Br2

I2

When liquid water changes to ice its volume expands. The expansion in volume is.

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5%

9%

10%

18%

In order to mention the B.P. of water at 110°C, the external pressure should be

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

760 torr

Any value of pressure

NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-unit cells

Only one unit cell

8-unit cells

Ionic solids are characterized by.

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Low melting points

High vapour pressures

Good conductivity in solid state

Solubility in polar solvents

The boiling point of water at Murree Hills.

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90^oC

98^oC

100^oC

120^oC

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

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Ether

Chloroform

Ethanol

Water

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

Which substances has diffused melting point.

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Crystalline solids

Amorphous solids

Metallic solids

Covalent solids

Long chains of amino acids are coiled about one another into a spiral by

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Covalent bond

Ionic bond

Hydrogen bond

Van Der Waal's forces

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

Which pair of compound are isomorphic in nature.

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NaCl and KNO3

KNO3 and MgO

MgO and NaF

CaF and CaCO3

Select the correct answer out of the following alternative suggestions London dispersion forces are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium is gaseous state at high temperature.

Molecules of solid I2

Molecule of H-Cl gas

The process in which liquid can be made to boil at low temperature in known as .........distillation

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Simple

Thermal

Steam

Vacuum

On which factor boiling point of a liquid depends.

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Amount of the liquid

Shape of the container of the liquid

Type of burner used for boiling

External pressure

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