Question # 1

London dispersion force are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium in gaseous state at high temperature

Molecule of solid iodine

Molecules of hydrogen chloride gas

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

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

The repulsion of electronic clouds of the molecules are responsible for the attractive forces among the molecules. These forces are

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Dipole-induced dipole forces

Ion-dipole forces

Instantaneous dipole-induced dipole forces

Dipole-dipole forces

Acetone and chloroform are soluble in each other due to.

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Intermolecular hydrogen bonding

Dipole dipole interaction

Instantaneous dipoles

All of the above

The boiling point of water at Murree Hills.

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90^oC

98^oC

100^oC

120^oC

In which system all the three axes are of equal length and all angles are at right angle.

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Cubic

Tetragonal

Orthorhombic

Hexagonal

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

Polymorphic substances have

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Same physical and chemical properties

Different physical and chemical properties.

Same physical but different chemical properties

Different physical and same chemical properties.

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

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

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

The molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

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

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

The polarizabilities of elements mostly increase down the group due to the reason that

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The atomic numbers increase

Number of protons increase

Number of shells increase along, with increase of shielding effect

The behavior of the elements remain the same

Ionic solids are characterized by.

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Low melting points

High vapour pressures

Good conductivity in solid state

Solubility in polar solvents

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

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

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5%

9%

10%

18%

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

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