Question # 1

The number of Cl- ions per unit cell of NaCl are

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6

4

2

8

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

Some of crystals are good conductors of heat and electricity, they may be

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ionic in nature

of metallic character

covalent in nature

of molecular nature

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

lonic solids don't conduct the electrical current because

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ion do not have translatory motion

free electrons are less

the coordination number of the ion is very high

strong covalent bonds are present in their structure

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

Metallic bonds have been explained by many theories. Luis Pauling has proposed a theory called

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molecular orbital theory

electron gas theory

band theory

valence bond theory

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

The electrical conductivity of the metals decreases with the increasing temperature. This is because

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the number of free electrons decrease

the bonds of the metal atoms become weak

the to and fro motion of the metal ions decrease

the increase of to and fro motion of the metal ions hinders the free movement of electrons

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

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