CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 11 - MCQExams.com

In a solid, atom $$M$$ occupy ccp lattice and $$1/3^{rd}$$ of tetrahedral voids are occupied by atom $$N$$. Find formula of solid formed by $$M$$ and $$N$$:-
  • $$M_3N_2$$
  • $$M_2N_3$$
  • $$M_4N_3$$
  • $$M_3N_4$$
Which is/are amorphous solid(s)?
  • $$NaCl$$
  • $$CaF_2$$
  • Glass
  • Plastic
$$NH_3$$ and $$BF_3$$form an adduct readily because they form
  • a coordinate bond
  • a hydrogen bond
  • an ionic bond
  • None of these
In an atomic bcc lattic what fraction of edge is not covered by atoms?
  • 032
  • 0.16
  • 0.134
  • 0.268
In an ionic compound $$A^{+}X^{-}$$, the radii of $$A^{+}$$ and $$X^{-}$$ ions are 1.0 pm and 2.0pm, respectively. The volume of the unit cell of the crystal AX will be :
  • $$27\ pm^{3}$$
  • $$64\ pm^{3}$$
  • $$125\ pm^{3}$$
  • $$216\ pm^{3}$$
An element $$X$$ (atomic mass $$= 24 gm/mol$$) forms a face centered cubic lattice. If the edge length of the lattice is $$4$$ x $$10^{-8}$$ $$cm$$ and the observed density is $$2.40$$ x $$10^{3}$$ $$kgm^{3}$$ then the percentage occupancy of lattice points by element $$X$$ is : (Use $$N_{A}$$ $$=$$ $$6$$ x $$10^{23}$$) 
  • $$96$$
  • $$98$$
  • $$99.9$$
  • None of the above
The density of nickel (face centered cubic cell) is $$8.94\ g/cm^3$$ at $$20^oC$$. What is the radius of the atom? (Atomic weight: $$Ni=59$$)
  • $$0.124 \ nm$$
  • $$0.136 \ nm$$
  • $$0.149 \ nm$$
  • $$0.110 \ pm$$
How many lithium atoms are present in a unit cell with edge length $$3.5\mathring { A } $$ and density $$\quad 0.53gcm^{ -3 }$$ ? (Atomic mass of Li =6.94) 
  • 2
  • 1
  • 4
  • 6
Packing efficiency of hcp structure is _________.
  • $$68\%$$
  • $$52.4\%$$
  • $$74\%$$
  • $$82\%$$
In NaCI unit cell if all the ions lying along the axis as shown in the figure are removed. the number of $${ Na }^{ + }$$ and $${ CI }^{ - }$$ remaining in the unit cell are.
1463461_ade20748c28e4f22ac3e410dc76c7e98.png
  • 4 and 4
  • 3 and 3
  • 1 and 1
  • 4 and 3
The number of carbon atoms in the unit cell of diamond is ___
  • 6
  • 1
  • 4
  • 8
The atom that present in the centre of BCC unit cell share with how many unit cells?
  • 1 unit cell
  • 4 unit cells
  • 3 unit cells
  • 2 unit cells
The co-ordination number of hexagonal close packing:
  • 4
  • 6
  • 8
  • 12
Which of the following defects decrease the density?
  • Interstitial defect
  • Vacancy defect
  • Frenkel defect
  • Schottky defect
The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is:
  • In (i) $$2$$ and in (ii) $$4$$
  • In (i) $$3$$ and in (ii) $$2$$
  • In (i) $$4$$ and in (ii) $$2$$
  • In (i) $$2$$ and in (ii) $$3$$
The three dimensional graph of lattice points which sets the pattern for the whole lattice is called:
  • Space lattice
  • simple lattice
  • Unit cell
  • Crystal lattice
Which of the following is not a characteristic of a crystalline solid?
  • Definite and characteristic heat of fusion
  • Isotropic nature
  • A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal
  • A true solid
Which of the following is an example of metallic crystal solid?
  • $$C$$
  • $$Si$$
  • $$W$$
  • $$AgCl$$
When radius of central atom is double with respect to corner atoms, then find out % packing efficiency.
1611389_34632c185bbd4d8f9c04bb4603d608fa.PNG
  • $$79$$%
  • $$90$$%
  • $$60$$%
  • $$65$$%
In a crystal, the atoms are located at the position of
  • zero potential energy
  • infinite potential energy
  • minimum potential energy
  • maximum potential energy
A match box exhibits _____ geometry.
  • cubic
  • orthorhombic
  • triclinic
  • monoclinic
Most crystals that show good cleavage because their atoms, ions or molecules are
  • weakly bonded together
  • strongly bonded together
  • spherically symmetrical
  • arranged in planes
In a crystal $$AB$$, which of the following crystal systems will have parameters, $$a\neq b\neq c$$ and $$\alpha = \beta = \gamma = 90^{\circ}$$?
  • Cubic
  • Orthorhombic
  • Monoclinc
  • Triclinic
The number of Bravais lattices in a cubic crystal is
  • $$3$$
  • $$1$$
  • $$4$$
  • $$14$$
The packing efficiency of the two dimensional square unit cell shown below is (all the circles are of the same radius).
1738292_f6f411a7ee414f5e81fb7114814c152d.jpg
  • $$39.27\%$$
  • $$68.02\%$$
  • $$74.05\%$$
  • $$78.54\%$$
Which is the most unstable Bravais Lattice?
  • Monoclinic
  • Triclinic
  • Romohedral
  • Tetrahedral
The decreasing order of the size of the void is
  • $$Cubic > octahedral > tetrahedral > trigonal$$
  • $$Trigonal > tetrahedral > octahedral > cubic$$
  • $$Trigonal > octahedral > tetrahedral > cubic$$
  • $$Cubic > tetrahedral > octahedral > trigonal$$
The volume of the hexagonal prism is ( radius of every sphere is $$r$$)
1740962_685765b3b0b243cfa246b662da575f22.png
  • $$24\sqrt 2 r^3$$
  • $$16\sqrt 2 r^3$$
  • $$12\sqrt 2 r^3$$
  • $$\dfrac{64}{3\sqrt 3}r^3$$
How many atoms ( spheres ) are contained within the hexagonal prism shown below in h.c.p. space lattice?
1740956_933f23bbe14243b2adada0044b055795.png
  • $$2$$
  • $$6$$
  • $$12$$
  • $$17$$
In hexagonal close packing of sphere in three dimensions:
  • In one unit cell there are 12 octahedral void and all are completely inside the unit cell.
  • In one unit cell there are six octahedral voids and all are completely inside the unit cell.
  • In one unit cell there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell.
  • In one unit cell there are 12 tetrahedral voids, all are completely inside the unit cell.
Select the correct statement (S) related to hexagonal close packing of identical spheres in three dimensions: 
  • In one unit cell there are 12 octahedral voids and all are completely inside the unit cell.
  • In one unit cell there are six octahedral voids and all are completely inside the unit cell.
  • In one unit cell there are six octahedral void and out of which three are completely inside the unit cell and other three are from contribution of octahedral void which are partially inside the unit cell
  • Co-ordination number of every sphere is 12 in hcp lattice.
In this crystal of $$Fe_{0.93}O$$, the percentage of $$Fe(III)$$ will be:
  • $$15\%$$
  • $$85\%$$
  • $$30\%$$
  • $$78\%$$
The cell content $$(Z)$$ of the unit cell of a h.c.p. space lattice is 
1740959_644bcc6299414bd3a6a03d4c6d3e899d.png
  • $$2$$
  • $$6$$
  • $$12$$
  • $$17$$
In melting lattice, structure of solid
  • Remains unchanged
  • Changes
  • Become compact
  • None of the above
Bravais lattices are of:
  • $$8$$ types
  • $$12$$ types
  • $$14$$ types
  • $$9$$ types
What is the packing fraction of $$_{26}^{56} Fe$$?

(Isotopic mass = 55.92066)
  • -14.167
  • 173.90
  • -14.187
  • -73.90
Atom A possesses higher values of packing fraction than atom B. The relative stabilities of A and B are:
  • A is more stable than B
  • B is more stable than A
  • A and B both are equally stable
  • Stability does not depend on packing fraction
Points defects are present in
  • Ionic solids
  • Molecular solids
  • Amorphous solids
  • Liquids
Which of the following is an amorphous solid
  • Glass
  • Diamond
  • Salt
  • Sugar
Which of the following features are not shown by quartz glass?
  • This is a crystalline solid.
  • Refractive index is same in all the directions.
  • This has definite heat of fusion.
  • This is also called supercooled liquid.
 Amorphous solid can also be called as
  • pseudo solids
  • true solids
  • super cooled liquids
  • super cooled solids
Amorphous material are supercooled solids.
  • True
  • False
A crystal lattice is a periodic structure in
  • $$2$$ dimension
  • $$3$$ dimension
  • vacuum space
  • none
Stacking of square close packed layers give rise to:
  • bcc structure
  • fcc structure
  • Simple cubic structure
  • hcp structure
The neon atoms has a radius of $$160\,pm.$$ What is the edge of the unit cell of a face centered structured of neon ?
  • $$490 \,pm$$
  • $$320 \,pm$$
  • $$453 \,pm$$
  • $$481 \,pm$$
A crystalline material may be crystalline in more than one geometrical form.
  • True
  • False
Which of the following has the smallest packing efficiency for atoms of a single type ?
  • Body centered cubic
  • Face centered cubic
  • Simple cubic
  • None of these
The numbers of tetrahedral and octahedral holes in a hexagonal primitive unit cell are :
  • $$8, 4$$
  • $$6, 12$$
  • $$2, 1$$
  • $$12, 6$$
In the close packing of atoms, there are :
  • one tetrahedral void and two octahedral voids per atom
  • two tetrahedral voids and one octahedral void per atom
  • two of each tetrahedral and octahedral voids per atom
  • one of each tetrahedral and octahedral void per atom
Graphite has h.c.p. arrangements of carbon atoms and the parallel planes are $$3.35 \,\mathring {A}$$ apart. Determine density of graphite:
  • $$2.46 \,g/cc$$
  • $$0.41 \,g/cc$$
  • $$1 \,g/cc$$
  • $$1.41 \,g/cc$$
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