Solid State Test

Result

Solid State Test - 7

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Weekly Quiz Competition

Question 1
1 / -0.25

Ionization enthalpy is lowest in

A
Hydrogen bond

B
Covalent bond

C
Metallic bond

D
All of these

Solution

Metals have low ionization energy because of there tendency to lose electrons.
Question 2
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The coordination number of AB having rock salt geometry is

A
2

B
6

C
8

D
4

Solution

NaCl has rock salt structure. Coordination No. is 6.
Question 3
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MgO has the structure of NaCl. The coordination number of the ions in MgO is

A
2

B
6

C
8

D
4

Solution

Coordination No. in NaCl is 6.
Question 4
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Type of stoichiometric defect shown by ZnS is

A
Schottky

B
Frenkel

C
Interstitial

D
Both a and b.

Solution

ZnS shows Frenkel defect.
Question 5
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A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is

A
144 pm

B
204 pm

C
288 pm

D
408 pm

Solution
Question 6
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An element forms a cubic unit cell with edge length 405 pm. Molar mass of this element is 2.7 X 10^-2 Kg/mol and its density is given as 2.7 X 10³ Kg/m3. How many atoms of this elements are present per unit cell.

A
4

B
2

C
1

D
6

Solution
Question 7
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A group of 14 element is converted into n –type semiconductor by dopping it with

A
group 17 elements

B
group 15 elements

C
Group 14 elements

D
group 16 elements

Solution

Group 15 doping on group 14 element forms n type semiconductor due to excess electrons.
Question 8
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Group 14 element is converted to p –type semiconductor by dopping it with

A
B

B
P

C
Mg

D
Ar

Solution

Doping of group 14 elements with group 13 forms p type semiconductor.
Question 9
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Giant ionic structures is also name given to

A
ionic lattice

B
crystal lattice

C
metallic lattice

D
covalent lattice
Solution
An ionic compound is a giant structure of ions.

The ions have a regular, repeating arrangement called an ionic lattice .

The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.
Question 10
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A substance forms face centered cubic crystals. Its density is 1.984 g/cm³ and the length of the edge of the unit cell is 630 pm. Calculate the molar mass in g/mol?

A
29.85

B
18.66

C
149.35

D
74.70

Solution
Question 11
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The hardest substance among the following is

A
Ti

B
Be₂ C

C
Graphite

D
SiC

Solution

It has network Structure.
Question 12
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The following diagram shows :

A
Frenkel defect

B
Interstitial

C
F –centers

D
Schottky defect

Solution

Extra electron is present at anionic site.
Question 13
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In n –type semiconductor current is carried by

A
Excess electron

B
positive hole

C
free electron

D
negative hole

Solution

N type semiconductors have excess electrons.
Question 14
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The following diagram shows

A
Frenkel defect

B
Interstitial

C
F –centers

D
Schottky defect

Solution

A Frenkel defect or dislocation defect is a type of point defect in crystalline solids named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location.
Question 15
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Which transition metal oxide has appearance and conductivity like that of copper?

A
Rhenium oxide

B
Titanium oxide

C
Ferric oxide

D
Silicon oxide

Solution

Rhenium oxide and cooper oxide have same appearance and conductivity.