Question # 1

Ionic solids are characterized by.

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Low melting points

High vapour pressures

Good conductivity in solid state

Solubility in polar solvents

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

Dipole-dipole forces are present among.

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Molecules of Iodine

Atoms of Neon i gaseous state

Chloroforms' molecules

CCl4 molecules

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

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

In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

In which , case particles are separated from each other.

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Fusion

Condensation

Neutralizations

Vaporization

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

The nature of copper crystals is

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Metallic

Ionic

Covalent

Molecular

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

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

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Cubic

Tetragonal

Orthorhombic

Hexagonal

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

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Simple

Thermal

Steam

Vacuum

Existence of an element in more than one crystalline form is known as.

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Anisotropy

Allotropy

Isomorphism

Unit cell

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

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