Question # 1

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

What is the co-ordination number of face centered cubic structure?

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12

8

6

10

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

The transition temperature of tin is

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95.5 C°

13.2 C°

13.2°C

128.5°

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

One of the following is a ionic solid. Which is that?

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Fe

KBr

Diamond

Cr

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

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

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

NaCI has 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-units cells

only one unit cell

8-unit cells

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

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

The existence of an element in more than one form is called

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allotropy

isomorphism

polymorphism

isotropy

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

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

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

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