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AM CHEMISTRY > UNIT#05 SOLIDS > Flashcards

UNIT#05 SOLIDS Flashcards

1
Q

The transition temperature is shown by which of the following pairs:

A

➡Allotrope
➡Polymorph
(different crystalline forms of compounds)

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2
Q

Lattice energy decreases with the increase in the size of ion because oppositely charged ions

A

become less tight

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3
Q

Ionic solids are called true solids :

A

Crystalline

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4
Q

Which ionic solid has the lowest lattice energy

A

CsCl

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5
Q

Which of the following intermolecular forces are present in solid iodine:
(Iodine is non-polar)

A

London Dispersion force

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6
Q

Which one of the following is not amorphous solid:

A

Table salt

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7
Q

Ionic solids are called true solids

A

Crystalline

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8
Q

The transition temperature of sulphur is:

A

95.5 °C

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9
Q

Which of the following is isotropic property?

A

Metallic conduction

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10
Q

When an element exists in more than one crystalline form, it is known as:

A

Allotropy

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11
Q

A solid may be made up of:

A

➡Atoms
➡Molecuels
➡Ions

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12
Q

Which one has the highest melting point and boiling point

A

Covalent crystal
(Network Structure)

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13
Q

In a crystal, the atoms are located at the position of:

A

Minimum Potential Energy
(in order to gain maximum stability)

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14
Q

Which of the following is anisotropic

A

Quartz
(Crystalline)

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15
Q

Crystalline parts of otherwise amorphous solids are known as:

A

Crystallites

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16
Q

Coinage metals are Cu, Ag and Au and they have ___ crystalline system

A

Cubic

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17
Q

In the crystal structure of NaCl, the arrangement of Cl- ions are:

A

Face centred cubic

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18
Q

In a crystal lattice the correct sequence of bond angles is:

A

bc=α, ca=β, ab=γ

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19
Q

Total unit cell dimensions are;

A

SIx

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20
Q

The cubic crystal system has the following unit cell dimensions

A

a=b=c and α=β=γ=90°

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21
Q

The crystalline form of white tin is:

A

Tetragonal

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22
Q

Molecular crystals are;

A

Soft
Formed by intermolecular forces

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23
Q

The crystals formed due to London forces of interaction are:

A

Molecular

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24
Q

The number of Cl- ions per units cell of a simple cubic lattice at the corer is/are:

A

1

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25
Q

Which is incorrect about the structure of iodine

A

I-I (g) > I-I (s)
Bond length

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26
Q

The coordination number of each ion in NaCl is:

A

6

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27
Q

The best conductors of electricity are;

A

Metallic solids

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28
Q

Independent molecule of NaCl may exist in:

A

Vapour Phase

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29
Q

Which of the following is an example of a polar molecular solids

A

Sugar
(have hydrogen bonding)

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30
Q

Solid CO2 (Dry ice) is an example of ___crystal

A

Molecular
(non-polar)

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31
Q

The coordination number of Na in the NaCl crystal is;

A

6

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32
Q

In the structure of NaCl, each sodium ion is surrounded by chloride ions

A

6

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33
Q

Which one of the following has the highest lattice energy

A

LiCl

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34
Q

The electrical conductivity of graphite is greater in one direction than in another due to;

A

Anisotropy

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35
Q

In diamond, each o the four outer electrons on every carbon atom is involved in covalent bonding. This means that there are no free electrons available. Which of the following property is explained by this statement

A

Diamond does not conduct heat and electricity

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36
Q

Graphite is one of the allotropic forms of Carbon it is;

A

➡Anisotrpic
➡Good conductor of electricity

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37
Q

A substance that has a sharp melting point in the following is

A

Diamond
(Crystalline solid)

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38
Q

The lattice energy is also called:

A

Crystal Energy

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39
Q

Which of the following is also an isomorph o copper?

A

Ag

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40
Q

Highest vapour pressure

A

Molecular solids

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41
Q

The molecular theory for metallic solids is;

A

Electron Gas Theory

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42
Q

Position of particles in crystalline solids represented by:

A

Lattice Point

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43
Q

The shape of iodine unit cells

A

Cubic

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44
Q

Radius ratio has units

A

Unitless

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45
Q

CuSO4.5H2O is an example of a crystal system

A

Triclinic

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46
Q

Which of the following solids is isotropic?

A

Amorphous solids

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47
Q

Properties due to a change of direction are called ___

A

Anisotropy

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48
Q

Which of the following has a transition temperature equal to 128 degrees celsius?

A

Na2CO3

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49
Q

Polymorphs have different:

A

Physical Properties

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50
Q

Allotropy is for:

A

Elements

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51
Q

HF has a higher boiling point than HCl due to:

A

Hydrogen bonding

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52
Q

Isomorphism is shown by:

A

➡Ionic solid
➡Metallic solid
➡Coinage metal

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53
Q

Current in electrolysis is carried through:

A

➡Postive ions
➡Negative ions

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54
Q

The most asymmetrical crystal system:

A

Cubic

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55
Q

Which one of the characteristics of ionic solids?

A

Solubility in polar solvents

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56
Q

The size and shape of the crystal depend upon some crystallographic elements which are:

A

6

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57
Q

The deliquescence is a property in which a solid

A

Absorbs moisture and turns to liquid form

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58
Q

Which one of them is known as supercooled liquids?

A

Glass

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59
Q

To conduct electricity through ionic solid, ions should be

A

Free

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60
Q

The smallest part of the crystal lattice has all the properties of the entire crystal this is called:

A

Unit cell

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61
Q

Lattice points are also called:

A

Lattice sites

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62
Q

The definite shape of NaCl crystal is its:

A

Habit

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63
Q

Which of the following are isomorphs

A

NaNO3, KNO3

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64
Q

Symmetry is the repetition of ___ when a crystal rotates at 360 ° along its axis

A

➡Faces
➡Angles
➡Edge

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65
Q

Which of the following is a directional bond?

A

H-bond

66
Q

The thermal conductivity of graphite is greater when a mobile electron is moving to its layers

A

Parallel

67
Q

Which of the following is true regarding polymorphism

A

same chemical properties

68
Q

Types of solids on basis of bonds present in them

A

4

69
Q

Ionic solids are;

A

Brittle

70
Q

The coordination of a number of Na in NaCl

A

6

71
Q

NaNO3 as unit cell

A

Rhombohedral

72
Q

2 sides of the unit cell and 3 angles are equal in;

A

Tetragonal

73
Q

Molecular solids are:

A

Bad conductors of electricity

74
Q

The lattice energy of NaCl:

A

-787 kJ/mol

75
Q

Metallic solids are:

A

Good conductor

76
Q

Which is true about copper:

A

Can be easily bent

77
Q

Lattice energy decrease when:

A

Charge to-size ratio decreases

78
Q

Which one of the following is a giant molecule

A

SiO2

79
Q

Molecular crystals are

A

Soft

80
Q

The overall structure of diamond looksIce occupies more space than liquid water

A

Hexagonal

81
Q

Ice occupies more space than liquid water

A

9%

82
Q

The crystals formed due to London forces of interaction are

A

Molecular

83
Q

The number of chloride ions per units cell of a simple cubic lattice at the corner is/are

A

1

84
Q

Ionic solids are characterized by

A

Solubility in polar solvents

85
Q

Which is incorrect about Structure of Iodine

A

I-I(g) < I-I(s) bond length

86
Q

Overall ratio of silicon to oxygen atoms in silicon (IV) oxide is

A

1: 2

87
Q

C-C Bond length in Diamond crystal are

A

154 pm

88
Q

In interior of silicon (IV) oxide crystal, each Silicon atom is directly connected with

A

Four oxygen atoms

89
Q

Iodine is a molecular solid because the forces between its molecules are

A

Van der Waals forces

90
Q

The coordination number of each ion in NaCl is

A

6

91
Q

The best conductors of electricity are

A

Metallic solids

92
Q

Which of the following statement is incorrect about silica

A

Has very high thermal expansion

93
Q

During which process empty spaces between particles become minimum

A

Condensation

94
Q

A solid maybe made up of

A

Atoms, Ions or molecules

95
Q

A malleable solid is one which can be

A

Converted into thin sheets

96
Q

Which solids are called true solids

A

Crystalline solid

97
Q

The arrangement ABC,ABC… is referred as

A

cubic close packing

98
Q

Crystalline solids are classified on the basis of bonding into ______ types

A

4

99
Q

Ionic crystals are characterized by

A

Solubility in polar solvents

100
Q

NaCl crystal is

A

Cubic

101
Q

Which element exists as discrete small molecule in the solid state

A

Iodine

102
Q

Ice floats on the liquid water because

A

Water freezes at 0°C and is less dense than liquid water

103
Q

Number of tetrahedral carbon atoms in unit cell of diamond is

A

4

104
Q

The number of chloride ions per unit cell of NaCl are

A

4

105
Q

The Crystal of diamond is

A

Covalent

106
Q

1 unit cell of NaCl contains ion pairs

A

4

107
Q

Which is not the property of silica

A

High thermal expansion

108
Q

Silicon(IV) oxide crystal is an example of

A

Covalent crystal

109
Q

Carbon atom in diamond is

A

sp3 hybridized

110
Q

The given crystal lattice is for

A

Iodine

111
Q

The volume of ice on freezing 200cm3 of water will be

A

218cm3

112
Q

I - I Bond distance difference between i2(g) and i2(s) is

A

4.9 pm

113
Q

Which one of the following contains maximum hydrogen bonding

A

H2O

114
Q

Ammonia shows the maximum boiling point because of

A

Enhanced electronegativity character of nitrogen

115
Q

The boiling point of H2O is 100°C while that of C2H5OH is 78.37°C. The reason is that

A

The number of hydrogen bonds per water molecule is greater than C2H5OH

116
Q

All are crystalline solids except

A

Glass

117
Q

Which is a pseudo solid?

A

Glue

118
Q

____ may be isotropic under ordinary conditions:

A

Bromine

119
Q

NaCl and CsF have same geometry because:

A

They have similar radii ratio

120
Q

K2SO4 and K2CrO4 are isomorphic substances they have similar properties except one:

A

Chemical Properties

121
Q

In structure of NaCl, the number of formula units per unit cell is:

A

4

122
Q

Ionic solids are mostly of high density due to:

A

Close packing of ions

123
Q

The molecuels of CO2 in dry ice form the:

A

Molecular Crystals

124
Q

The arrangement of particles as a points in a crystal is called:

A

➡Crystal Lattice
➡Space Lattice

125
Q

Unit cell is the smallest part and represented all features of the entire ____

A

Crystal

126
Q

Crystalline solids have different properties;
1. Allotropy
2. Isomorphism
3. Polymorphism
Ionic compounds show which of the above properties:

A

➡II
➡III

127
Q

Which property is incorrect about silica:

A

➡High transparency of light❌
➡Very low thermal expansion❌
➡Excellent insulator❌
➡Soluble in water✅

128
Q

Which of the following is wrong?

A

➡Water has maximum density at 4°C❌
➡Molecular solids are relatively soft and volatile❌
➡In graphite carbon atom has tetrahedral geometry✅
➡Graphite is a good conductor of electricity❌

129
Q

Which one is not the anisotropic behaviour:

A

➡Cleavage of crystal❌
➡Electrical Conductivity❌
➡Co-efficient of thermal expansion❌
➡Melting Point and Boiling Point✅

130
Q

Which of the following is anisotropic?

A

Crystalline Solid

131
Q

The lattice energy is maximum for:

A

MgF2

132
Q

Ionic solids do not conduct the electrical current because:

A

Ions dont have translatory motion

133
Q

The number of ion pairs per unit cell of NaCl are:

A

4

134
Q

Crystalline solids are classified on the basis of bonding into;

A

Four types

135
Q

In a crystal lattice the correct sequence of bond angles is:

A

bc=α, ca=β, ab=γ

136
Q

The number of Cl-1 ions per unit cell of NaCl is;

A

4

137
Q

The crystal of a diamond is;

A

Covalent

138
Q

One unit cell of NaCl contains ion pairs:

A

Four

139
Q

The share of Na+ ion on each edge in the NaCl unit cell is;

A

1/4

140
Q

Silicon (IV) oxide crystal is an example of;

A

Covalent Crystal

141
Q

The carbon atom in a diamond is;

A

sp3 hybridized

142
Q

The given crystal lattice is for:

A

Iodine

143
Q

The volume of ice on freezng 200 cm^3 of water will be:

A

218 cm^3

144
Q

I-I bond distance difference between I2 and I2 is:

A

4.9 pm

145
Q

Molecules in dry ice forms:

A

Covalent Crystal

146
Q

Ionic solids are characterized by:

A

Solubility in a polar solvent

147
Q

The lattice energy of NaCl is;

A

-787 kJ/mol

148
Q

Which of the following is layered covalent crystalline solid

A

Cadmium Iodide

149
Q

Maximum lattice energy is shown by:

A

LiCl

150
Q

One unit cell of NaCl contains ion pairs;

A

Four

151
Q

Which is incorrect about the structure of iodine;

A

➡Face-Centered Cubic❌
➡Metallic Appearance❌
➡I-I(g) > I-I(s)✅
➡I-I(g) < I-I(s)❌

152
Q

The overall ratio of silicon to oxygen atoms in silicon (IV) oxide is;

A

1:2

153
Q

C-C bond lengths in the diamond crystals are;

A

154 pm

154
Q

The rate of evaporation of a liqui d does not depend on:

A

Material of container

155
Q

Type of hybridization in diamond:

A

sp3

156
Q

The overall structure of the diamond looks;

A

Face-centred cubic

157
Q

The number of Cl-1 ions per unit cell of NaCl is;

A

4

158
Q

The crystal of a diamond is;

A

Covalent

159
Q

The crystals formed due to London forces of interaction are:

A

Molecular

160
Q

The number of Cl-1 ions per unit cell of a simple cubic lattice at the corner is/are:

A

1

AM CHEMISTRY (19 decks)

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