Question # 1

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

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

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8

12

6

4

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.

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

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

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59^oC

69^oC

83^oC

75^oC

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

Which of the following is psuedo solid

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CaF2

Glass

NaCl

All

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

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

When water freezes, its volume increase.

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12%

9%

15%

18%

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

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 molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

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

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

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