Question # 1

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

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

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

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

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

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

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59^oC

69^oC

83^oC

75^oC

In which , case particles are separated from each other.

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Fusion

Condensation

Neutralizations

Vaporization

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 molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

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

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Very small size of nitrogen

Long pair of electrons present on nitrogen

Enhanced electronegative character of nitrogen

Pyramidal structure of NH3

When water freezes at 0 ^oC, its density decrease 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

Which of the following can form H-bonds

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NH₃

C₂H₆

NaCI

CHCI₃

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

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8

12

6

4

The molecule of CO2 in dry ice form the.

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Ionic crystals

Covalent crystals

Molecular crystals

Any type of crystals

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

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

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