Question # 1

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

How temperature affects the electrical conductivity of metals?

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Does not change at all

Decreases with increasing temperature

Increases with increasing temperature

Decreases with decreasing temperature

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

lonic solids are characterized by which one of the following properties

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moderately low pressure

high vapour pressure

good conductivity in solid state

solubility in polar solvents

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

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

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

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

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

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

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

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12

8

6

10

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

A crystal system in which all three angles and all three edges are different is called

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triclinic

rhombohedral

cubic

hexagonal

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

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