CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 5 - MCQExams.com

The total number of lattice arrangements in different crystal systems is:
  • $$14$$
  • $$8$$
  • $$3$$
  • $$7$$
Which of the following is an interstitial compound?
  • $$ PdCl_2 $$
  • $$ NH_3 $$
  • $$ZnO$$
  • $$TiH$$
Which primitive unit cell has unequal edge lengths ($$a \neq b \neq c$$) and all axial angles different from 90?
  • Tetragonal
  • Hexagonal
  • Monoclinic
  • Triclinic
What is the number of ions per $$cc$$ in the crystal of $$NaCl$$ at normal temperature?
  • $$10^{6}\ ions$$
  • $$10^{22}\ ions$$
  • $$10^{16}\ ions$$
  • $$10^{8}\ ions$$
Which of the following have maximum lattice energy :
  • $$LiF$$
  • $$CsCl$$
  • $$KBr$$
  • $$NaCl$$
In a cube, X atoms are present at corners and Y atoms are at face centres of a cube. The number of X and Y are:
  • $$8,8$$
  • $$6,8$$
  • $$8,6$$
  • $$6,6$$
In $$CaF_2$$ lattice coordination number of $$Ca^{+2}$$ & $$F^-$$ is :
  • $$4,4$$
  • $$8, 8$$
  • $$4, 8$$
  • $$8, 4$$
The type of defect in $$NaCl$$ crystal will be -
  • point defect
  • interstitial defect
  • vacancy defect
  • impurity defect
An element X (A.w =80 g/mol) having fcc structure.Calculate the number of unit cells in 8g of X: 
  • $$0.4 \times N_4$$
  • $$0.1 \times N_4$$
  • $$4 \times N_A$$
  • $$N_A /40$$
A compound is formed by cation $$C$$ and anion $$A$$. The anions form hexagonal close packed (hcp) lattice and the cations occupy $$75\%$$ of octahedral voids. The formula of the compound is :
  • $$C_2A_3$$
  • $$C_3A_2$$
  • $$C_3A_4$$
  • $$C_4A_3$$
In tetragonal crystal system, which of the following is true?
  • All axial lengths and all axial angles are equal
  • All three axial lengths are equal
  • All three axial angles are equal
  • Two axial angles are equal but the third is different
Which one of the following is correct?
  • Schottky defect lowers the density.
  • Frenkel defect increases the dielectric constant of the crystals.
  • Stoichiometric defects make the crystals good electrical conductors.
  • All of the above.
Which has a minimum percent volume occupied by the spheres?
  • Simple cubic
  • Body-centred cubic
  • Hexagonal closed packed
  • Cubic closed packed
Which of the following does not represent a type of crystal system?
  • Triclinic
  • Monoclinic
  • Rhombohedral
  • Isotropical
An element (atomic mass $$=100$$ amu) having a bcc structure has a unit cell edge equal to $$400$$ pm. The density (in g cm$$^{-3}$$) of the element is:
  • $$10.376$$
  • $$5.200$$
  • $$7.289$$
  • $$2.144$$
The number of basic crystal system present in the solid structure is:
  • $$7$$
  • $$8$$
  • $$6$$
  • $$4$$
Amorphous solids are:
  • Solid substances in real sense
  • Liquids in real sense
  • Supercooled liquids
  • Substances with definite melting point
$$TiO_{2}$$ is a well known example of :
  • triclinic system
  • tetragonal system
  • monoclinic System
  • none of the above
A metal crystallises as body centred cubic lattice with the edge length of unit cell equal to $$0.304$$ nm. If the molar mass of the metal is $$50.3$$ g mol$$^{-1}$$, its density (in g cm$$^{-3}$$) is :
  • $$5.945$$
  • $$2.9725$$
  • $$8.9175$$
  • $$4.458$$
Percentage of free space in cubic close-packed structure and in body centred packed structure are, respectively:
  • $$30\%$$ and $$26\%$$
  • $$26\%$$ and $$32\%$$
  • $$32\%$$ and $$48\%$$
  • $$48\%$$ and $$26\%$$

Hydrogen occupies the _________ holes, while carbon and nitrogen occupy __________ holes. 
  • tetrahedral and octahedral
  • octahedral and tetrahedral
  • octahedral and octahedral
  • tetrahedral and tetrahedral
Aluminium has fcc structure. The edge length of the unit cell is $$404$$ pm. If the density of the metal is $$2.7$$ g cm$$^{-3}$$, the molar mass (in gmol$$^{-1}$$) of Al atom is :
  • $$28.20$$
  • $$30.40$$
  • $$26.80$$
  • $$25.20$$
An element crystallises in a bcc lattice. Nearest neighbours and percentage of volume occupied by spheres in the unit cell are :
  • $$8,\ 74\%$$
  • $$8,\ 68\%$$
  • $$6,\ 74\%$$
  • $$6,\ 68\%$$
Body diagonal of a cube is $$866$$ pm. Its edge length would be:
  • $$408$$ pm
  • $$1000$$ pm
  • $$500$$ pm
  • $$600$$ pm
The effective radius of an iron atom is $$1.42\ \mathring A$$. It has FCC structure. Calculate its density (in g.cm$$^{-3}$$) if it is given that the atomic mass of $$Fe$$ is $$56$$ amu.
  • $$2.47$$
  • $$5.74$$
  • $$8.24$$
  • None of the above
A metal crystallizes in two cubic phases, fcc and bcc whose unit cell lengths are $$3.5 \mathring A$$ and $$3.0 \mathring A$$ respectively. The ratio of density of fcc and bcc is :
  • $$2$$
  • $$1.26$$
  • $$3.34$$
  • $$1.8$$
Edge length of a cube is $$400$$ pm. Its body diagonal (in pm) would be:
  • $$566$$
  • $$600$$
  • $$500$$
  • $$693$$
An element crystallizes as a face-centred cubic lattice with edge length equal to $$460$$ pm. The density (in gcm$$^{-3}$$) of the element X when molar mass of X atom is $$60$$ gmol$$^{-1}$$ is:
  • $$4.096$$
  • $$2.048$$
  • $$6.144$$
  • $$3.072$$
Percentage of free space in a body-centred cubic unit cell is:
  • $$34%$$
  • $$28%$$
  • $$30%$$
  • $$32%$$
The volume occupied by atoms in a simple cubic unit cell is (edge length $$=$$ a) :
  • $$a^{3}$$
  • $$\dfrac {4\pi a^{3}}{3}$$
  • $$\dfrac {\pi a^{3}}{6}$$
  • $$\dfrac {\sqrt {3}\pi}{8}$$
In a multi layered close-packed structure :
  • there are twice as many tetrahedral holes as many close-packed atoms
  • there are as many tetrahedral holes as many closed packed atoms
  • there are twice as many octahedral holes as many close-packed atoms
  • there are as many tetrahedral holes as many octahedral holes
An ionic compound XY forms a crystal structure in which 'Y' atoms form ccp lattice and 'X' atoms are sopositioned that each 'X'-atom touches 6'Y'-atoms. If the nearest distance between two 'X'-atoms is $$2\sqrt{2}$$ ,then the density ($$g/cm^{3}$$) of XY crystal is :
  • $$5\sqrt{6}$$
  • $$\frac{20}{3}$$
  • $$\frac{5}{6}$$
  • $$\frac{5}{3}$$
The fraction of total volume occupied by the atoms present in a simple cubic lattice is:
  • $$\dfrac{\pi }{4}$$
  • $$\dfrac{\pi }{6}$$
  • $$\dfrac{\pi }{3\sqrt{2}}$$
  • $$\dfrac{\pi }{4\sqrt{2}}$$
Crystal systems in which no two axial lengths are equal is/are :
  • tetragonal
  • orthorhombic
  • monoclinic
  • triclinic
In the fluorite structure if the radius ratio is $$\left ( \sqrt{\frac{3}{2}}-1 \right )$$ how many ions does each cation touch ?
  • 4 anions
  • 12 cations
  • 8 anions
  • No cations
Which of the following statements is not correct?
  • The number of carbon atoms in a unit cell of diamond is 4
  • The number of Bravais lattices in which a crystal can be categorized is 14
  • The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
  • Molecular solids are generally volatile
Which one of the following is a pseudo solid?
  • Calcium fluoride
  • Glass
  • Sodium chloride
  • All of the above
Which of the following has a regular repeated molecular pattern in three dimensional space?
  • Solids and liquids
  • Liquids and gases
  • Solids
  • Gases
The edge length of the NaCl unit cell is if radius of $$Na^+$$ is 97 pm and radius of it is 181 pm :
  • 556 pm
  • 278 pm
  • 139 pm
  • 120 pm
An element A (atomic weight = $$100$$ amu) having bcc structure has unit cell edge length of $$400$$ pm. Calculate the density (in g/cc) of A?
  • $$5.188$$
  • $$7.188$$
  • $$4.144$$
  • $$10.144$$
$$TiO_2$$ is well known example of :
  • triclinic system
  • tetragonal system
  • monoclinic system
  • none of the above
Analysis show that nickel oxide consist of nickel ion with 96% ions having $$d^a$$ configuration and 4% having $$d^7$$ configuration. Which amongst the following best represents the formula of the oxide?
  • $$Ni_{1.02}O_{1.00}$$
  • $$Ni_{0.96}O_{1.00}$$
  • $$Ni_{0.96}O_{0.98}$$
  • $$Ni_{0.98}O_{1.00}$$
Consider a cube containing n unit cells of a cubic system. A plane ABCD obtained by joining the mid points of the edges on one of its identical faces had atoms arranged as shown. Let p be the packing fraction. Choose the correct option:
114747_0bcf40afdeac4fe68617c62160edff6d.JPG
  • $$n=1, p=\frac {22}{21\sqrt 2}$$
  • $$n=8, p=\frac {11}{21}$$
  • $$n=8, p=\frac {11}{4}$$
  • $$n=1, p=\frac {11\sqrt 3}{28}$$
$$KF$$ crystallizes in the $$NaCl$$ type structure. If the radius of $$K^{+}$$ ions is $$132$$ pm and that of $$F^{-}$$ ion is $$135$$ pm , what is the shortest $$K-F$$ distance?
  • $$267\ pm$$
  • $$534\ pm$$
  • $$378\ pm$$
  • $$None\ of\ the\ above$$
Statement 1: Distance between nearest lattice points in BCC is greater than the same in FCC having same edge length.
Statement 2: FCC has greater packing efficiency than BCC.
  • Statement-1 is true, statement-2 is true and statement-2 is the correct explanation for statement-1
  • Statement-1 is true, statement-2 is true and statement-2 is not the correct explanation for statement-1
  • Statement-1 is true, statement-2 is false
  • Statement-1 is false, statement-2 is true
The interstitial hole is called tetrahedral because :
  • it is formed by four spheres
  • partly same and party different
  • it is formed by four spheres, the centres of which from a regular tetrahedron
  • none of the above
If edge length of the cube is $$3.60A^o$$, then radius of carbon atom is:
  • $$0.78A^o$$
  • $$0.92 A^o$$
  • $$0.64 A^o$$
  • $$0.35 A^o$$
Calculate the density of diamond from the fact that it has a face-centered cubic structure with two atoms per lattice point and unit cell edge length of $$3.569 \times 10 ^{-8}$$ cm.
  • 3.509 g/cm$$^{3}$$
  • 7.012 g/cm$$^{3}$$
  • 10.12 g/cm$$^{3}$$
  • None of the above
A unit cell of sodium chloride has four formula units. The edge of length of the unit cell is $$0.564$$ nm. What is the density (in g/cc) of sodium chloride?
  • $$1$$
  • $$2.16$$
  • $$4.32$$
  • None of the above
If a is the lattice parameter, the volume of an fcc crystal having $$N$$ atoms is :
  • $$\displaystyle \frac{Na^3}{4}$$
  • $$\displaystyle \frac{Na^3}{2}$$
  • $$\displaystyle Na^3$$
  • $$\displaystyle 2Na^2$$
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