Question # 1

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 molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

The shape of diamond crystal is.

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cubic

Hexagonal

Tetragonal

Orthorhombic

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

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

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

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98^oC

100^oC

69^oC

120^oC

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

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

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

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Ether

Chloroform

Ethanol

Water

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.

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.

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

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Anisotropy

Allotropy

Isomorphism

Unit cell

Amorphous solids.

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Have sharp melting points.

Undergo clean cleavage when cut with knife

Have perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms.

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

Molecular crystals are generally

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Hard

Relatively soft

Unstable

do not exist

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

In which , case particles are separated from each other.

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Fusion

Condensation

Neutralizations

Vaporization

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

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

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

Which of the given has hydrogen bonding.

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CH4

CCl4

NH3

NaCl

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