CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 9 - MCQExams.com

The empty space left in hcp in three-dimensions is__________.
  • $$26$$%
  • $$74$$%
  • $$52.4$$%
  • $$80$$%
The flame colours of metal ions are due to:
  • metal excess defect
  • metal deficiency defect
  • Schottky defect
  • Frenkel defect
$$KBr$$ crystallises in $$NaCl$$ type of crystal lattice and its density is $$2.75 g/cm^3$$. Number of unit cells of $$KBr$$ present in a 1.00 $$mm^3$$ grain of $$KBr$$ are:
  • $$3. 6 \times 10^{18}$$
  • $$3. 6 \times 10^{16}$$
  • $$2. 34 \times 10^{23}$$
  • $$6.02 \times 10^{24}$$
Crystals are formed by ions, atoms, and molecules having an internal pattern that is ___________ and ___________.
  • irregular, non-repeating
  • regular, repeating
  • regular, non-repeating
  • none of the above
Which one of the following has a different crystal lattice from those of the rest?
  • $$Ag$$
  • $$V$$
  • $$Cu$$
  • $$Pt$$
  • $$Au$$
In a face-centre cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face-centre, one of A atom is missing from one corner in the unit cell. The simplest formula of the compound is:
  • $$A_{24}B_7$$
  • $$A_7B_{24}$$
  • $$A_7B_4$$
  • $$AB_2$$
Arrangement of sulphide ions in zinc blende is
  • Simple cubic
  • HCP
  • BCC
  • FCC
Iron crystallises in a bcc system with a lattice parameter of $$2.861\mathring { A } $$. Calculate the density of iron in the bcc system 
[atomic weight of $$Fe=56,{ N }_{ A }=6.02\times { 10 }^{ 23 }{ mol }^{ -1 }$$].
  • $$7.94g\ m{ L }^{ -1 }$$
  • $$8.96g\ m{ L }^{ -1 }$$
  • $$2.78g\ m{ L }^{ -1 }$$
  • $$6.72g\ m{ L }^{ -1 }$$
The pyknometer density of $$NaCl$$ crystal is $$2.165\times { 10 }^{ 3 }kg\quad { m }^{ -3 }$$ while its X-rays density is $$2.178\times { 10 }^{ 3 }kg\quad { m }^{ -3 }$$. The fraction of the unoccupied sites in $$NaCl$$ crystal is:
  • $$5.968$$
  • $$5.96\times { 10 }^{ -2 }$$
  • $$5.96\times { 10 }^{ -3 }$$
  • $$ 5.96\times { 10 }^{ -4 }$$
If silver iodide crystallizes in a zinc blendek structure with $$I^-$$ ions forming the lattice, then the fraction of the tetrahedral voids occupied by $$Ag^+$$ ions will be:
  • 10%
  • 25%
  • 50%
  • 75%
When heated above $$ 916^o C , $$ iron changes its crystal structure from bcc to ccp structure without any change in the radius of atom. The ratio of density of the crystal before heating and after heating is :
  • $$ 1. 089 $$
  • $$ 0.918 $$
  • $$ 0.725 $$
  • $$ 1.231$$
In a crystal, atoms are located at the position of:
  • Maximum potential energy
  • Minimum potential energy
  • Zero potential energy
  • Infinite potential energy
Which of the following defect is seen in $$FeO$$? 
  • Metal excess defect
  • Metal deficiency defect
  • Displacement defect
  • Impurity defect
An element occurs in two crystalline forms $$\alpha$$ and $$\beta$$. The $$\alpha$$-form a fcc arrangement with $$a=3.68$$ $$\mathring{A}$$ and the $$\beta$$-form has a bcc arrangement with $$a=2.92 \mathring { A}$$. Calculate the ratio of their densities. 
  • 2 : 1
  • 1 : 2
  • 1 : 3
  • 1 : 1
In a face centred cubic arrangement of $$A$$ and $$B$$ atoms when $$A$$ atoms are at the corner of the unit cell and $$B$$ atoms of the face centres. One of the $$A$$ atom is missing from one corner in unit cell. The simplest formula of compound is:
  • $$A_{7}B_{3}$$
  • $$AB_{3}$$
  • $$A_{7}B_{24}$$
  • $$A_{7}B_{8}$$
If the height of $$HCP$$ unit cell of identical particles is $$h$$, then height of octahedral voids from the base is________.
  • $$\dfrac {h}{2}$$
  • $$\dfrac {h}{3}, \dfrac {2h}{3}$$
  • $$\dfrac {h}{4}, \dfrac {3h}{4}$$
  • $$\dfrac {h}{8}, \dfrac {7h}{8}$$
Which type of 'defect' has the presence of cations in the interstitial sites ?
  • Frenkel defect
  • Metal deficiency defect
  • Schottky defect
  • Vacancy defect
Which among the following metals crystallise as a simple cube?
  • Polonium
  • Iron
  • Copper
  • Gold
A solid can be irreversibly deformed. The stamping of sheets of steel into 'fins' of motor cars is a case of :
  • Vaccum deformation
  • Plastic deformation
  • Elastic deformation
  • Flexible shaping
The major binding force in diamond, silicon and quartz is:
  • electrostatic force
  • electrical attraction
  • covalent bond force
  • van der waals force
A crystalline structure has radius ratio ($$r_+ /r_-$$) in the range of $$0.225-0.414$$. The coordination number and arrangement of anions around the cations are:
  • $$3$$, plane triangular
  • $$6$$, octahedral
  • $$4$$, tetrahedral
  • $$8$$, cubic
Which type of crystals contains more than one Bravais lattice?
  • Hexagonal
  • Triclinic
  • Rhombohedral
  • Monoclinic
In $$ABC$$ packing if the number of atoms in the unit cell is $$n$$ then the number of tetrahedral voids in the unit cell is equal to:
  • $$n$$
  • $$\dfrac{n}{2}$$
  • $$\dfrac{n}{4}$$
  • $$2n$$
The unit cell shown in the figure belongs to :
933423_001bf0e85de440b192224090f340fc5f.PNG
  • $$NaCl$$ type
  • $$ZnS$$ type
  • $$CsCl$$ type
  • $$CaF_2$$ type
A compound is formed by two elements $$Y$$ and $$Z.$$ The elements $$Z$$ forms $$ccp$$ and atoms $$Y$$ at $$1/3$$ rd of tetrahedral voids. The formula of the compound is:
  • $$Y_2Z_3$$
  • $$YZ$$
  • $$YZ_3$$
  • $$Y_2Z$$
The radii of $$Na^+$$ and $$Cl^-$$ ions are $$95 pm$$ and $$181 pm$$ respectively. The edge length of $$NaCl$$ unit cell is:
  • 276 pm
  • 138 PM
  • 552 pm
  • 415 pm
Which of the following is true about the value of refractive index quartz glass?
  • Same in all direction
  • Different in different direction
  • Cannot be measured
  • Always zero
The sharp melting point of crystalline solids is due to______.
  • a regular arrangement of constituent particles observed over a short distance in crystal lattice.
  • a regular arrangement of constituent particles observed over a long distance in crystal lattice.
  • same arrangement of constituent particles in different direction
  • different arrangement of constituent particles in different directions
A unit of $$BaCl_2$$ (fluorite structure) is made up of:
  • four $$Ba^{2+}$$ ions and four $$Cl^-$$ ions
  • four $$Ba^{2+}$$ ions and eight $$Cl^-$$ ions
  • eight $$Ba^{2+}$$ ions and four $$Cl^-$$ ions
  • four $$Ba^{2+}$$ ions and six $$Cl^-$$ ions
Complete the following table:
934463_1a627685b6a548fba13ceb8bc1de71ea.png
  • (A)- Impurity defects, (B)- Stoichiometric defects, (C)- Non-stoichiomeric defects (D)- Anion excess defects
  • (A)- Stoichiometric defects, (B)- Non-stoichiomeric defects, (C)- Impurity defects, (D)- Metal excess defects
  • (A)- Non-stoichiomeric defects, (B)- Stoichiometric defects, (C)- Impurity defects, (D)- Cation vacancy
  • (A)- Impurity defects, (B)- Stoichiometric defects, (C)- Metal excess defects, (D)- Non-stoichiomeric defects
Silver halides generally show
  • Schottky defect
  • Frenkel defect
  • both Frenkel and Schottky defects
  • cation excess defect
Which of the following is an amorphous solid?
  • Graphite $$(C)$$
  • Quartz glass $$(SiO_2)$$
  • Chrome alum
  • Silicon carbide $$(SiC)$$
Iodine molecules are held in the crystals lattice by ______.
  • london forces
  • dipole-dipole interaction
  • covalent bonds
  • coulombic forces
The correct order of the packing efficiency in different types of the unit cell is:
  • fcc < bcc <simple cubic
  • fcc > bcc >simple cubic
  • fcc < bcc >simple cubic
  • bcc < fcc >simple cubic
The total number of tetrahedral voids in face centered unit cell is ______.
  • 6
  • 8
  • 10
  • 12
In which pair most efficient packing in present?
  • $$hcp$$ and $$bcc$$
  • $$hcp$$ and $$ccp$$
  • $$bcc$$ and $$ccp$$
  • $$bcc$$ and simple cubic cell
For a certain crystal system the relation between edge lengths (a, b, and c) is
a = b = c
The relation between axial angles $$\left( {\alpha ,\beta \,\,{\text{and}}\,\gamma } \right)$$ is $$\alpha  = \beta  = \gamma $$
The pair of crystal system for which above relation holds true is:
  • cubic and triclinic
  • cubic and tetragonal
  • hexagonal and orthorhombic
  • cubic and rhombohedral
The lattice site in a pure crystal cannot be occupied by ______.
  • molecule
  • ion
  • electron
  • atom
The percentage of empty space in body centered cubic arrangement is _______.
  • 74
  • 68
  • 32
  • 26
Number of tetrahedral void completely inside a BCC metallic crystal is:
  • 0
  • 2
  • 3
  • 4
If the ratio of coordination no. of $$A$$ to that $$B$$ is $$x:y$$, then the ratio of no. of atoms of $$A$$ to that no. of atoms of $$B$$ in unit cell is ___.
  • $$x:y$$
  • $$y:x$$
  • $$x^2:y$$
  • none of the above
The ionic radius of $$Cl^-$$ ion is $$1.81A^0$$. The interionic distance of $$NaCl$$ and $$NaF$$ are $$2.79A^0$$ and $$2.31A^0$$ respectively. The ionic radius of $$F^-$$ ion will be:
  • $$0.98A^0$$
  • $$0.80A^0$$
  • $$1.33A^0$$
  • $$2.29A^0$$
By X-ray diffraction it is found that nickel (at mass $$= 59 \,g \,mol^{-1}$$), crystallized with $$ccp$$. The edge length of the unit cell is $$3.52 \mathring{A}$$. If density of $$Ni$$ crystal is $$8.94 \,g/cm^3$$. Then value of Avogadro's number from the date is:
  • $$5.05 \times 10^{23}$$
  • $$4.11 \times 10^{23}$$
  • $$3.02 \times 10^{23}$$
  • $$6.023 \times 10^{23}$$
The unit cell cube length of $$LiCl$$ ($$NaCl$$ structure) is $$5.14\overset{o}{A}$$. Assuming anion-anion contact, calculate the ionic radius for chloride ion.
  • $$2.05$$
  • $$1.82$$
  • $$2.92$$
  • $$3.92$$
The number of unit cells in $$58.5$$ g of $$NaCl$$ is nearly ?
  • $$6 \times 10^{23}$$
  • $$3\times 10^{22}$$
  • $$1.5\times 10^{23}$$
  • $$0.5\times 10^{24}$$
Copper has fcc crystal structural. Assuming an atomic radius of $$130$$ pm for copper atom. What is the edge length of the unit cell? $$(Cu=63.54)$$
  • $$3680$$ pm
  • $$368$$ pm
  • $$3.68$$ pm
  • $$268$$ pm
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? $$[Na=23, Cl=35.5]$$
  • $$1.16$$ g$$/cm^3$$
  • $$2.62$$ g$$/cm^3$$
  • $$2.16$$ g$$/cm^3$$
  • $$3.16$$ g$$/cm^3$$
If the ratio of the coordination number of $$A$$ to that of $$B$$ is $$x:y$$, then the ratio of number of atoms of $$A$$ to that of $$B $$ in the unit cell is:
  • $$x:y$$
  • $$y:x$$
  • $${ x }^{ 2 }:y$$
  • $$y:{ x }^{ 2 }$$
A compound $$AB$$ has rock salt type structure. The formula weight of $$AB$$ is $$6.023 \ Y$$ amu, and closest $$A-B$$ distance is $$Y^{1/3}$$ nm, where $$Y$$ is an arbitrary number, find the density of the lattice.
  • $$5$$ kg$$/m^3$$
  • $$5\times 10^{-3}$$ g$$/m^3$$
  • $$10^{-3}$$ g$$/m^3$$
  • $$15\times 10^{-2}$$ g$$/m^3$$
In the crystal $$A^{2+}B^{2-}$$, having anions in the face centred cubic packing if the radius of the anion if $$1.84A^0$$, ideal radius of the cation present in the tetrahedral hole will be:
  • $$0.225A^0$$
  • $$0.414A^0$$
  • $$0.732A^0$$
  • none of these
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