Question # 1

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

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

NH₃shows a maximum boiling point among the hydrides of V-A group elements due to

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Very small size of nitrogen

Lone pair electrons present on Nitrogen

Enhanced electronegative character of Nitrogen

Pyramidla structure of NH₃

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

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

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

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

The boiling point of water at the top mount Everest is.

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59^oC

69^oC

83^oC

75^oC

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

Molecular crystals are generally

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Hard

Relatively soft

Unstable

do not exist

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

There is no free electron present in the crystal of diamond to conduct electricity

None of the above

The number of Na, ions which surround each CI^1-ion the NaCI crystal lattice is

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8

12

6

4

NH3 shows a maximum boiling point among the hydrides of V-A group elements due to.

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Very small size of nitrogen

Lone pair of electron present on nitrogen

enhanced electronegative character of nitrogen

Pyramidal structure of NH3

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

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

Diamond is a bad conductor of electricity because

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It has a tight structure

It has a high density

There are no free electrons present in the crystal of diamond to conduct electronics

None of these

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

Which pair of molecule have Debye forces in them

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Ar and Ar

Argon and water

Na+ ions and water

water and water

London dispersion forces 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

Molecules of solid iodine

Molecules of hydrogen chloride gas

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 molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

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.

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

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