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Solid State Mcq Neet Chemistry
Quiz 5
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Q.1
The number of octahedral void(s) per atom present in a cubic close-packed structure is
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a) 1
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b) 2
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c) 3
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d) 4
Explanation
In ccp structure ABAB . Thus ions are located at corner Number of ions per unit cell =1 Thus number of octahedral void = 1 Answer : (a)
Q.2
Assertion: The compressibility factor hydrogen varies with pressure with positive slope at all pressures Reason: Even at low pressures, the repulsive forces dominate in hydrogen gas
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a) If both the assertion and reason are true and reason explains the assertion.
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b)If both the assertion and reason are true but reason does not explain the assertion
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c) If assertion is true but reason is false
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d) If assertion is false but reason is true.
Explanation
Answer : (a)
Q.3
The interionic distance for cesium chloride crystal will be ... [ PMPMT 2007]
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a) 2 (a/√3)
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b) a
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c) a/2
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d) a(√3/2)
Explanation
Cesium Chloride is body centred cubic crystal, Cesium is at the centre of cubic structure. Interionic distance means the nearest neighbor distance, Which half of the body diagonal which is equal to a(√3/2) Answer : (d)
Q.4
Close packing is maximum in the crystal lattice of ...
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a) face-centred cubic
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b) body-centred cubic
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c) simple cubic
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d) none of these
Explanation
face-centred cubic efficiency = 74% Packing efficiency for BCC = 68% Packing efficiency simple cubic lattice is 52.4% Answer : (a)
Q.5
Spinel structure is shown by ...
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a) MgAl2O4
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b) ZnAl2O4
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c) MgFe2O4
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d) all of these
Explanation
The spinels are any of a class of minerals of general formulation A2+ B23+ O42- which crystallise in the cubic (isometric) crystal system, with the oxide anions arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the octahedral and tetrahedral sites in the lattice. Answer : (d)
Q.6
A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice, 'O' atoms at the edges of the cube and sodium atom at the centre of the cube. The formula of compound is
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a) NaWO2
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b) Na2WO3
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c) NaWO3
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d) NaWO4
Explanation
Edges are 12, each edge shared by 4 neighbour. Answer : (c)
Q.7
Sodium metal exists in bcc unit cell. The distance between nearest sodium atoms is 0.368nm. The edge length of the unit cell is ..
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a) 0.415 nm
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b) 0.384 nm
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c) 0.68 nm
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d) 0.425 nm
Explanation
In bcc unit cell a√3 = 4r distance between nearest atom = 2r = 0.368 nm Answer : (d)
Q.8
What is the name of the phenomenon wherein mechanical stress causes the production of electricity?
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a) Pyroelectric effect
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b) Piezoelectricity effect
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c) Phoroelectric effect
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d) Ferroelectric effect
Explanation
Answer : (b)
Q.9
A solid X+ Y- has bcc structure. If the distance of closest approach between the two ions is 173 pm, the edge length of the cell is
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a) 200 pm
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b) 142.2 pm
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c) (√3/2)pm
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d) √2 pm
Explanation
In bcc distance of closest approach Answer : (a)
Q.10
The number of atoms per unit cell in a simple cubic, face-centred cubic and body-centred cubic are ...
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a) 1, 4, 2
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b) 4, 1, 2
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c) 2, 4, 1
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d) 4, 8, 2
Explanation
Answer : (a)
Q.11
Assertion: Frenkel defect is found in silver halides Reason: Size of Ag+ ion is smaller than halide ion
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a) If both the assertion and reason are true and reason explains the assertion.
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b)If both the assertion and reason are true but reason does not explain the assertion
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c) If assertion is true but reason is false
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d) If assertion is false but reason is true.
Explanation
Answer : (a)
Q.12
In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is ...[ BHU 2008]
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a) interstitial defect
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b) vacancy defect
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c) Frenkel defect
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d) Schottky defect
Explanation
Answer : (c)
Q.13
In a face-centred cubic unit cell, edge length is ...[ DPMT 2005]
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a)
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b)
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c) 2r
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d)
Explanation
Answer : (b)
Q.14
The second order Bragg diffraction of X-rays with λ=1.0Å from a set of parallel planes in a metal occurs at an angle 60°. The distance between the scattering planes in the crystal is .... [ CBSE 1998]
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a) 1.155 Å
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b) 1.00 Å
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c) 2.00 Å
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d) 1.7 Å
Explanation
nλ = 2dsinθ 2×1.0 = 2×d×sin60 2 = d√3 2/√3 = d d= 1.155 Å Answer : (a)
Q.15
Which of following is not a molecular solid?
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a) Glucose
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b) Silicon
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c) Dry ice
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d) Naphthalene
Explanation
Silicon is a network soild Answer : (b)
Q.16
An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body-centre, the alloy has the formula
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a) Cu4Ag2Au
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b) Cu4Ag4Au
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c) CuAgAu
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d) Cu4Ag3Au
Explanation
The ccp structure there are atoms at the 8 corners of the cube, and also in the centers of the 6 faces of the cube. Thus number of atoms of Cu = 8×(1/8) + 6×(1/2) = 4 Number of Silver atoms at ages = 12 ×(1/4) = 3 Number of Gold atoms at body centre = 1 ∴ formula is Cu4Ag3Au Answer : (d)
Q.17
Which one of the following is a non-conductor in solid state but becomes a good conductor on melting?
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a) Diamond
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b) Ice
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c) Sodium
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d) Potassium chloride
Explanation
Answer : (d)
Q.18
Which of the following is not an example of 13-15 compound?
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a) InSb
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b) CdSe
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c) GaAs
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d) AlP
Explanation
Answer : (b)
Q.19
Assertion: No compound has both Schottky and Frenkel defects Reason: Both defects change the density of the solid
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a) If both the assertion and reason are true and reason explains the assertion.
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b)If both the assertion and reason are true but reason does not explain the assertion
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c) If assertion is true but reason is false
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d) If assertion and reason both are false
Explanation
AgBr Frenkel and Schottky defects. thus assertion is flase Frenkel defect does not change the density thus Reason is a false statement Answer : (d)
Q.20
If AB has NaCl structure, 'A' atoms occupy the corners of unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry will be
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a) A3B4
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b) AB2
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c) A2B
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d) A4B3
Explanation
In NaCl type structure, A atoms will be located at corners and face-centres. Atom 'B' will be at edge centres and centre A unit cell. Number of atoms of 'A' = 8×(1/8) + 4×(1/2) = 3 Number of atoms of 'B' = 12×(1/4) +1 = 4 Simple formula = (A3B4) Answer : (a)
Q.21
Chromium metal crystallises in body-centred cubic lattice. The length of unit cell is found to be 287pm. Atomic radius of chromium will be
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a) 62.135 pm
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b) 87.21 pm
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c) 124.27 pm
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d) 112.12 pm
Explanation
For body-centred cubic unit cell a√3 = 4r Answer : (c)
Q.22
The distance between Na+ and Cl- ion in NaCl is 281pmWhat is the edge length of the cube?
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a) 1405pm
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b) 562pm
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c) 843pm
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d) 281pm
Explanation
Edge length = 2[rna+ + rCl-] Edge length = 2×281 = 562pm Answer : (b)
Q.23
Assertion: Meniscus of a liquid disappears at the critical temperature Reason: Density of liquid and its gaseous phase become equal at the critical temperature ...[ BHU 2008]
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a) If both the assertion and reason are true and reason explains the assertion.
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b)If both the assertion and reason are true but reason does not explain the assertion
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c) If assertion is true but reason is false
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d) If assertion is false but reason is true.
Explanation
critical temperature is the temperature of a gas in its critical state, above which it cannot be liquefied by pressure alone. Answer : (c)
Q.24
The edge length of face-centred unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is ...[ CBSE 1998]
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a) 144 pm
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b) 288 pm
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c) 398 pm
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d) 618 pm
Explanation
rcation + ranion = (1/2) × edge length 110 + ranion = (1/2) ×508 = 254 ranion = 144 pm Answer : (a)
Q.25
The intermetallic compound Liag crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is ...[ CBSE 1997]
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a) simple cube
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b) body-centred cube
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c) face-centred cube
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d) none of these
Explanation
Answer : (b)
Q.26
The coordination number of a metal crystallizing in a hexagonal close packed (hcp) structure is ...[ MPPMT 2004]
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a) 6
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b) 12
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c) 4
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d) 8
Explanation
Answer : (b)
Q.27
The edge length of face-centred cubic cell of an ionic substance is 508pm. If the radius of cation is 110pm, the radius of anion is ...
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a) 144 pm
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b) 288 pm
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c) 398 pm
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d) 618 pm
Explanation
Edge length = 2(r+ + r-) 508 = 2(110 + -) r- = 144 pm Answer : (a)
Q.28
in a crystalline solid, anion A are arranged in ccp lattice and cation occupy 50% of octahedral void and 50% of the tetrahedral voids. What is the formula of the solid
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a) AB
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b) A3B2
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c) A2B2
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d) A2B3
Explanation
Number of A atoms in ccp = n Number of tetrahedral void = 2n Number of octahedral void = n Number of atoms of B = n/2 +n = (3/2)n A:B = n :n(3/2) A:B = 2:3 Formula is A2B3 Answer : (d)
Q.29
In CsCl, the distance of closet approach between cation an anion will be ...
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a)
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b)
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c)
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d)
Explanation
In CsCl has bcc Distance of closest approach is half of body diagonal = a(√3/2) Answer : (c)
Q.30
The Ca2+ and F- are located CaF2 crystal respectively at face-centred cubic lattice points and in ...[ AIIMS 2006]
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a) tetrahedral voids
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b) half of tetrahedral voids
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c) octahedral voids
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d) half of octahedral voids
Explanation
Ca2+ ions are present in ccp arrangement and F- ions occupy all tetrahedral voids Answer : (a)
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