Solid State and Colligative Properties Test 3

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:The correct statement in the following is

Answers Choices:

The ionic crystal of \(AgBr\) has Schottky defect

The unit cell having crystal parameters, \(a = b \ne c,\,\,\)\(\alpha = \beta = {90^o},\,\,\gamma = {120^o}\) is hexagonal

In ionic compounds having Frenkel defect the ratio \(\frac{{{\gamma _ + }}}{{{\gamma _ - }}}\) is high

The coordination number of \(N{a^ + }\)ion in \(NaCl\) is 4

Questions 2 of 50

Question:Crystals can be classified into ...... basic crystal habits

Answers Choices:

3

7

14

4

Questions 3 of 50

Question:How many molecules are there in the unit cell of sodium chloride

Answers Choices:

2

4

6

8

Questions 4 of 50

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

Answers Choices:

Maximum P.E.

Minimum P.E.

Zero P.E.

Infinite P.E.

Questions 5 of 50

Question:The total number of lattice arrangements in different crystal systems is

Answers Choices:

3

7

8

14

Questions 6 of 50

Question:The close packing represents ABC ABC...... order of

Answers Choices:

Body centred cubic packing

Face centred cubic packing

Simple cubic packing

Hexagonal cubic closed packing

Questions 7 of 50

Question:The arrangement ABC ABC ABC ….. is referred as

Answers Choices:

Octahedral close packing

Hexagonal close packing

Tetragonal close packing

Cubic close packing

Questions 8 of 50

Question:The number of close neighbour in a body-centred cubic lattice of identical sphere is

Answers Choices:

8

6

4

2

Questions 9 of 50

Question:The number of equidistant oppositely charged ions in a sodium chloride crystal is

Answers Choices:

8

6

4

2

Questions 10 of 50

Question:\(Na\) and \(Mg\) crystallize in BCC and FCC type crystals respectively, then the number of atoms of \(Na\) and \(Mg\) present in the unit cell of their respective crystal is

Answers Choices:

4 and 2

9 and 14

14 and 9

2 and 4

Questions 11 of 50

Question:The ratio of close-packed atoms to tetrahedral holes in cubic close packing is

Answers Choices:

1:1

1:2

1:3

2:1

Questions 12 of 50

Question:A solid is made of two elements \(X\) and \(Z\). The atoms \(Z\) are in CCP arrangement while the atom \(X\) occupy all the tetrahedral sites. What is the formula of the compound

Answers Choices:

\(XZ\)

\(X{Z_2}\)

\({X_2}Z\)

\({X_2}{Z_3}\)

Questions 13 of 50

Question:An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be

Answers Choices:

\(AB\)

\({A_2}B\)

\(A{B_3}\)

\({A_3}B\)

Questions 14 of 50

Question:The vacant space in the bcc unit cell is

Answers Choices:

32%

23%

26%

None of these

Questions 15 of 50

Question:The number of octahedral voids in a unit cell of a cubical closest packed structure is

Answers Choices:

1

2

4

8

Questions 16 of 50

Question:Ferrous oxide has a cubic structure and each edge of the unit cell is 5.0 Å. Assuming density of the oxide as \(4.0g - c{m^{ - 3}}\), then the number of \(F{e^{2 + }}\) and \({O^{2 - }}\) ions present in each unit cell will be

Answers Choices:

Four \(F{e^{2 + }}\) and four \({O^{2 - }}\)

Two \(F{e^{2 + }}\) and four \({O^{2 - }}\)

Four \(F{e^{2 + }}\) and two \({O^{2 - }}\)

Three \(F{e^{2 + }}\) and three \({O^{2 - }}\)

Questions 17 of 50

Question:Which of the following statements is not true about \(NaCl\) structure

Answers Choices:

\(C{l^ - }\)ions are in fcc arrangement

\(N{a^ + }\)ions has coordination number 4

\(C{l^ - }\)ions has coordination number 6

Each unit cell contains \(4NaCl\) molecules

Questions 18 of 50

Question:In \(CsCl\) structure, the coordination number of \(C{s^ + }\) is

Answers Choices:

Equal to that of \(C{l^ - }\), that is 6

Equal to that of \(C{l^ - }\), that is 8

Not equal to that of \(C{l^ - }\), that is 6

Not equal to that of \(C{l^ - }\), that is 8

Questions 19 of 50

Question:In a solid ‘AB’ having the \(NaCl\) structure, ‘A’ atoms occupy the corners of the cubic unit cell. If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

Answers Choices:

\(A{B_2}\)

\({A_2}B\)

\({A_4}{B_3}\)

\({A_3}{B_4}\)

Questions 20 of 50

Question:In solid \(CsCl\) each \(Cl\) is closely packed with how many \(Cs\)

Answers Choices:

8

6

10

2

Questions 21 of 50

Question:In \(CsCl\) lattice the coordination number of \(C{s^ + }\) ion is

Answers Choices:

2

4

8

12

Questions 22 of 50

Question:Crystal structure of \(NaCl\) is

Answers Choices:

\(fcc\)

\(bcc\)

Both 1 and 2

None

Questions 23 of 50

Question:In \(NaCl\) lattice the coordination number of \(C{l^ - }\) ion is

Answers Choices:

2

4

6

8

Questions 24 of 50

Question:In zinc blende structure the coordination number of \(Z{n^{2 + }}\) ion is

Answers Choices:

2

4

6

8

Questions 25 of 50

Question:Coordination number of \(N{a^ + }\) ion in rock salt is

Answers Choices:

12

4

8

6

Questions 26 of 50

Question:In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is

Answers Choices:

Presence of \(N{a^ + }\)ions in the crystal lattice

Presence of \(C{l^ - }\)ions in the crystal lattice

Presence of electron in the crystal lattice

Presence of face centered cubic crystal lattice

Questions 27 of 50

Question:Frenkel defect is caused due to

Answers Choices:

An ion missing from the normal lattice site creating a vacancy

An extra positive ion occupying an interstitial position in the lattice

An extra negative ion occupying an interstitial position in the lattice

The shift of a positive ion from its normal lattice site to an interstitial site

Questions 28 of 50

Question:Which one of the following has Frenkel defect

Answers Choices:

Sodium chloride

Graphite

Silver bromide

Diamond

Questions 29 of 50

Question:Schottky defect generally appears in

Answers Choices:

\(NaCl\)

\(KCl\)

\(CsCl\)

All of these

Questions 30 of 50

Question:Schottky defect in crystals is observed when

Answers Choices:

Density of crystal is increased

Unequal number of cations and anions are missing from the lattice

An ion leaves its normal site and occupies an interstitial site

Equal number of cations and anions are missing from the lattice

Questions 31 of 50

Question:When electrons are trapped into the crystal in anion vacancy, the defect is known as

Answers Choices:

Schotky defect

Frenkel defect

Stoichiometric defect

F-centres

Questions 32 of 50

Question:Schottky defect defines imperfection in the lattice structure of a

Answers Choices:

Solid

Liquid

Gas

Plasma

Questions 33 of 50

Question:The formula for determination of density of unit cell is

Answers Choices:

\(\frac{{{a^3} \times {N_o}}}{{N \times M}}g\,c{m^{ - 3}}\)

\(\frac{{N \times M}}{{{a^3} \times {N_o}}}g\,c{m^{ - 3}}\)

\(\frac{{{a^3} \times M}}{{N \times {N_o}}}g\,c{m^{ - 3}}\)

\(\frac{{M \times {N_o}}}{{{a^3} \times N}}g\,c{m^{ - 3}}\)

Questions 34 of 50

Question:Potassium fluoride has \(NaCl\) type structure. What is the distance between \({K^ + }\) and \({F^ - }\) ions if cell edge is \(a\,\,cm\)

Answers Choices:

\(2a\,\,cm\)

\(a/2\,\,cm\)

\(4a\,\,cm\)

\(a/4\,\,cm\)

Questions 35 of 50

Question:In a face centred cubic cell, an atom at the face contributes to the unit cell

Answers Choices:

1/4 part

1/8 part

1 part

1/2 part

Questions 36 of 50

Question:The interionic distance for cesium chloride crystal will be

Answers Choices:

a

\(\frac{a}{2}\)

\(\frac{{\sqrt 3 a}}{2}\)

\(\frac{{2a}}{{\sqrt 3 }}\)

Questions 37 of 50

Question:Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29 Å. What is the radius of sodium atom

Answers Choices:

\(1.857 \times {10^{ - 8}}cm\)

\(2.371 \times {10^{ - 7}}cm\)

\(3.817 \times {10^{ - 8}}cm\)

\(9.312 \times {10^{ - 7}}cm\)

Questions 38 of 50

Question:For an ionic crystal of the type \(AB,\) the value of (limiting) radius ratio is 0.40. The value suggests that the crystal structure should be

Answers Choices:

Octahedral

Tetrahedral

Square planar

Plane triangle

Questions 39 of 50

Question:Solid \(C{O_2}\) is an example of

Answers Choices:

Molecular crystal

Ionic crystal

Covalent crystal

Metallic crystal

Questions 40 of 50

Question:Value of heat of fusion of \(NaCl\) is

Answers Choices:

Very low

Very high

Not very low and not very high

None of the above

Questions 41 of 50

Question:Piezoelectric crystals are used in

Answers Choices:

TV

Radio

Record player

Freeze

Questions 42 of 50

Question:Which of the following is true for diamond

Answers Choices:

Diamond is a good conductor of electricity

Diamond is soft

Diamond is a bad conductor of heat

Diamond is made up of \(C,\,\,H\)and \(O\)

Questions 43 of 50

Question:Among solids the highest melting point is established by

Answers Choices:

Covalent solids

Ionic solids

Pseudo solids

Molecular solids

Questions 44 of 50

Question:To get a n- type semiconductor, the impurity to be added to silicon should have which of the following number of valence electrons

Answers Choices:

1

2

3

5

Questions 45 of 50

Question:Which of the following is non-crystalline solid

Answers Choices:

\(CsCl\)

\(NaCl\)

\(Ca{F_2}\)

Glass

Questions 46 of 50

Question:The lustre of a metal is due to

Answers Choices:

Its high density

Its high polishing

Its chemical inertness

Presence of free electrons

Questions 47 of 50

Question:Silicon is

Answers Choices:

Semiconductor

Insulator

Conductor

None of these

Questions 48 of 50

Question:Which of the following statements about amorphous solids is incorrect

Answers Choices:

They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and incompressible

Questions 49 of 50

Question:The ability of a given substance to assume two or more crystalline structure is called

Answers Choices:

Amorphism

Isomorphism

Polymorphism

Isomerism

Questions 50 of 50

Question:Glass is

Answers Choices:

Supercooled liquid

Crystalline solid

Amorphous solid

Liquid crystal