CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 2 - MCQExams.com

Total number of layer between a distance of $$14R \sqrt { \frac { 2 }{ 3 }  } $$ in help unit cell ?
  • 5
  • 8
  • 6
  • None of these
Packing fraction in a body-centred cubic cell of crystals is  
  • $$\frac{{\sqrt 3 }}{8}\pi $$
  • $$\frac{\pi }{6}$$
  • $$\frac{{\sqrt 2 }}{6}\pi $$
  • $$\frac{1}{{2\sqrt 2 }}\pi $$
In case of cubic system, the number of types of space lattices?
  • 3
  • 7
  • 14
  • 12
Percentage of free space in cubic close packed structure and in body centred packed structure are respectively ___________.
  • $$30 \% \quad and \quad 26\%$$
  • $$26 \% \quad and \quad 32\%$$
  • $$48 \% \quad and \quad 48\%$$
  • $$32 \% \quad and \quad 26\%$$
A metallic element crystallizes into a lattice containing a  sequence of layers of AB AB AB....Any packing of spheres leaves out voids in the lattice. The empty space in percentage by volume in this lattice is: 
  • 26%
  • 32%
  • 20%
  • 30%
Which of the following is not related to amorphous solids?
  • They do not have sharp melting points
  • They are rigid and hard
  • They are not bound by plane surfaces
  • They give diffraction bands
Which of the following molecule has higher lattice energy?
  • NaCl.
  • $$Mg_1N_3$$.
  • Both (A) and (B) have equal lattice energy.
  • None of these
Crystals have 'vacant sites' or 'defects' in them. When light strikes a photographic silver bromide paper, silver atoms move in through these defects to:
  • develop the film
  • form tiny clumps of silver atoms
  • form negative images
  • form a colour image
The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is:
  • exactly the same in both cases
  • partly same and partly different
  • different from each other
  • nothing definite
Which of the following statements are true for glasses?
  • They are amorphous solids.
  • They are supercooled liquids.
  • They have long range order.
  • Both A and B  are correct.
The maximum percentage of available volume that can be filled in a face centred cubic system by an atom is:
  • $$74\%$$
  • $$68\%$$
  • $$34\%$$
  • $$26\%$$
Glass is:
  • Supercooled liquid
  • Crystalline solid
  • Liquid crystal
  • Amorphous solid
In which of the following arrangements, a metal would have the least density?
  • BCC
  • CCP
  • HCP
  • SC
Which of the following is not a crystalline solid? 
  • Potassium Chloride
  • Caesium Chloride
  • Glass
  • Rhombic sulphur
Amorphous solids:
  • possess sharp melting points.
  • undergo clean cleavage when cut with a knife.
  • do not undergo clean cleavage when cut with a knife.
  • possess orderly arrangement over long distances.
Potassium crystallizes in a:
  • face-centred cubic lattice
  • body-centred cubic lattice
  • simple cubic lattice
  • orthorhombic lattice
Crystal of sodium chloride belong to the ______ system.
  • orthorhombic
  • cubic
  • trigonal
  • monoclinic
How many kinds of space lattices are possible in a crystal?
  • $$7$$
  • $$23$$
  • $$30$$
  • $$14$$
In a hexagonal close packed (hcp) structure of spheres, the fraction of the volume occupied by the spheres is A. In a cubic close packed structure, the fraction is B. The relation between A and B is:
  • $$A=B$$
  • $$A > B$$
  • $$A < B$$
  • None of the above
The crystalline sodium has body centred cubic unit cell with edge length equal to $$0.424$$ nm at $$298$$ K. The density (in kg m$$^{-3}$$) of sodium metal at $$298$$ K is:
  • $$1.002\times 10^{3}$$
  • $$1.002\times 10^{-3}$$
  • $$2\times 10^{3}$$
  • $$2\times 10^{-3}$$
The density of metal which crystallise in $$bcc$$ lattice with unit cell edge length $$300$$ pm and molar mass $$50$$ g mol$$^{-1}$$ will be:
  • $$10$$ g cm$$^{-3}$$
  • $$14.2$$ g cm$$^{-3}$$
  • $$6.15$$ g cm$$^{-3}$$
  • $$9.31$$ g cm$$^{-3}$$
An element with atomic mass 100 has a $$bcc$$ structure and edge length 400 pm. The density of element is:
  • 10.37 g $$cm^{-3}$$
  • 5.19 g $$cm^{-3}$$
  • 7.29 g $$cm^{-3}$$
  • 2.14 g $$cm^{-3}$$
A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?
  • 3.89 g $$cm^{-3}$$
  • 2.16 g $$cm^{-3}$$
  • 3 g $$cm^{-3}$$
  • 1.82 g $$cm^{-3}$$
Match the List -I (reduction process) with List - II (element).
List -I
(reduction process)		List - II
(element)
(P) Number of occupied O.V. in diamond unit -cell(1) 2
(Q) Coordination no.of $$ S^{2-}$$ in zinc blend structure(2) 6
(R)$$  _{ 92 }^{ 238 }{ U\rightarrow _{ 82 }^{ 214 }{ Pb } } $$, number of $$ \alpha $$ - particles given out (3) 4
(S) $$ _{ 13 }^{ 29 }{ Al }\rightarrow _{ 13 }^{ 27 }{ Al } $$ , number of $$ \beta $$ particles given out (4) 0
  • P-4 Q-2 R-3 S-1
  • P-2 Q-4 R -1 S-3
  • P-4 Q-3 R -2 S-1
  • P-2 Q-4 R -3 S-1
Number of atoms per unit cell, if atoms are present at the corner of unit cell and 2 atoms at each body diagonal
  • 9
  • 10
  • 6
  • 4
Among the following, the compound with high lattice energy is 
  • NaCl
  • $${\text{MgC}}{{\text{l}}_{\text{2}}}$$
  • KCl
  • CsF
Which pair is correct order of lattice energy?
  • KCl > MgO
  • AIN > MgO
  • CaO > BaO
  • $${\text{MgC}}{{\text{O}}_{\text{3}}} > {\text{CaC}}{{\text{O}}_{\text{3}}}$$
Two metals A and B crystallize in $$bcc$$ and $$fcc$$ type structures. The ratio of number of atoms of A and B present in unit cell of their crystals is 
  • 0.5
  • 1
  • 2
  • 4
A unit cell of diamond consists of ______.
  • 6 units
  • 4 units
  • 8 units
  • 10 units.
What is the C.N. of a sphere in square packing in 2-D?
  • 4
  • 6
  • 12
  • 1
Rank of simple unit cell is:
  • 1
  • 2
  • 4
  • 6
Two ions $${ A }^{ + }$$ and $${ B }^{ - }$$ have radii of $$0.88\overset { \circ  }{ A } $$ and $$2\overset { \circ  }{ A } $$ respectively. What will be the type of crystal?
  • fcc
  • bcc
  • Simple cubic
  • None of these
Packing fraction in 2-D hexagonal packing is
  • 0.32
  • 0.68
  • 0.91
  • 0.78
If sodium metal crystallizes in body centered cubic lattice and unit cell of sodium has edge length of 4.29 $$A^0$$, then what is the radius of sodium?
  • $$1.86 A^0$$
  • $$3.22A^0$$ 
  • $$5.72 A^0$$
  • $$0.93 A^0$$
The packing fraction in 2-D square packing is equal to:
  • 0.91
  • 0.78
  • 0.32
  • 0.68
The coordination number of tetrahedral void:
  • 3
  • 4
  • 6
  • 2
The packing efficiency of a simple cubic crystal with an interstitial atom exactly fitting at the body center is:
  • $$0.48$$
  • $$0.52$$
  • $$0.73$$
  • $$0.91$$
AAA type packing in 3D has a unit cell as :
  • primitive
  • FCC
  • BCC
  • CCP
The percentage of empty space in simple cubic unit cell:
  • 52%
  • 42%
  • 48%
  • 68%
A metallic element has simple cubic arrangement. The number of unit cells in 100 g of this metal $$(edge\ length\ = 288\ pm,\ density\ =\ 7.2\ g\ { cm }^{ -3 })\ are\ 5.8\times { 10 }^{ 23 }$$. The total number of atoms in 100 g of the metal is:
  • $$5.8\times { 10 }^{ 24 }$$
  • $$5.8\times { 10 }^{ 23 }$$
  • $$0.58\times { 10 }^{ 23 }$$
  • $$58\times { 10 }^{ 24 }$$
The percentage of empty space and coordination number in the unit cell of simple cubic lattice is:
  • $$47.6,6$$
  • $$52.4,6$$
  • $$47.6,8$$
  • $$32,8$$
In an FCC unit cell, atoms are numbered as shown below.The atoms not touching each other are:
(Atom numbered 3 is face centre of front face).
1516074_f875bfde569c49589c774d6c99293fee.png
  • 3 & 4
  • 1 & 3
  • 1 & 2
  • 2 & 4
The increasing order of the crystal field splitting power of same common lingands is:
  • $${ H_2O}<{OH}^-<{ Cl }^{ - }<{ F}^{ - }<{ CN }^{ - }$$
  • $${ H }_{ 2 }O<{ Cl }^{ - }<{ OH }^{ - }<{ CN}^{ - }<{ F}^{ - }$$
  • $${ CN }^{ - }<{ H }_{ 2 }O<{ OH }^{ - }<{ F }^{ - }<{ Cl }^{ - }$$
  • $${ Cl }^{ - }<{ F}^{ - }<{ OH }^{ - }<{ H_2O }<{ CN}^-$$
The one that is extensively used as a piezoeletric material is:
  • Quartz
  • Amorphous silica
  • Mica
  • Tridymic
Which of the following cannot be regarded as molecular solid?
  • $$SiC$$
  • $$AlN$$
  • $$Diamond$$
  • $$All\ of\ the\ above$$
Which of the following correctly describes the structure of $$CaF_2$$ ?
  • $$CN\quad of\quad { Ca }^{ 2+ }=\quad 8,\quad CN\quad of\quad F^-\quad =\quad 4,4\quad Ca^{ 2+ }\quad and\quad 8\quad F^-\quad per\quad unit\quad cell\quad $$
  • $$CN\quad of\quad { Ca }^{ 2+ }=\quad 4,\quad CN\quad of\quad F^-\quad =\quad 8,8\quad Ca^{ 2+ }\quad and\quad 4\quad F^-\quad per\quad unit\quad cell\quad $$
  • $$CN\quad of\quad { Ca }^{ 2+ }=\quad 4,\quad CN\quad of\quad F^-\quad =\quad 8,4\quad Ca^{ 2+ }\quad and\quad 8\quad F^-\quad per\quad unit\quad cell\quad $$
  • $$CN\quad of\quad Ca^{ 2+ }\quad =\quad 8,\quad CN\quad of\quad F^{ - }=4,8\quad Ca^{2+}\quad and\quad 4\quad F^-\quad per\quad unit\quad cell\quad $$
Calcium metal crystallises in fcc lattice with edge length 556 pm. Calculate the density of metal.
  • 1.5455
  • 3.992
  • 1.00
  • 5.00
A compound has a BCC unit cell with an edge length of 10A. If the density is 2 $$g/cm^{3}$$ then the molar mass of the compound  is 
  • 600
  • 300
  • 350
  • 250
Which of the following is/are pseudo solids?
I. $$KCl$$ 
II. Barium chloride dihydrate
III. Rubber 
IV. The solid cake left after the distillation of coal tar
  • I, III
  • II, III
  • III, IV
  • only III
How many numbers of atoms per unit cell in the following unit cell?
1542711_6cd507dca42e44469c153289d4a499ac.jpg
  • 5
  • 3
  • 2
  • 4
0:0:1


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