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Solid State Mcq Neet Chemistry
Quiz 2
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Q.1
In a face-centred cubic lattice, atom A occupies the corner position and atom B occupies the face-centre positions. If one atom of B is missing from one of the face-centred points, the formula of the compounds is ...
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a) A2B2
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b) A2B
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c) AB2
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d) A2B5
Explanation
Atoms 'A' occupies corner, Number of atoms of A = 8 ×(1/8) = 1 Atom 'B' is missing from one of the face Number of atoms of 'B' = 5×(1/2) = 5/2 A:B = 1 : (5/2) = 2:5 Simplest formula is A2B5 Answer : (d)
Q.2
In a solid lattice, cation is absent from lattice site and present at an interstitial position, the lattice defect is
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a) Schottky
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b) Frenkel
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c) Interstitial
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d) None of these
Explanation
When cation is absent from lattice site and occupy interstitial site, the defect is called Frankel defect Answer:(b)
Q.3
If a stands for the edge length of the cubic systems, simple cubic, body-centred cubic and face-centred cubic, then the ratio of radii of the sphere in these system will be respectively ...[ CBSE 2008]
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a)
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b)
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c)
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d)
Explanation
Simple unit cell = (a=2r) Face-centred unit cell (a√2 = 4r) Body-centred unit cell (a√3 = 4r) Required ration: Answer : (c)
Q.4
A solid has structure in which 'W' atoms are located at the corners of the cube, 'O' atoms are at the centre of the edges and Na atoms are at the centre of the cube. The formula of the 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
Number of Na atoms = 1 (At body-centre) Number of 'W' atoms = 8 × (1/8) = 1 ( At the corners) Number of 'O' atoms = 12 × (1/4) = 3 (At edge-centres) Formula of solid = NaWO3 Answer : (c)
Q.5
An element (atomic mass = 100) having bcc structure has unit cell edge 400pm. Then, density of element is ... [ CBSE 1996]
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a) 10.376 g/cc
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b) 5.191 g/cc
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c) 7.289 g/cc
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d) 2.144 g/cc
Explanation
For bcc structure Z = 2 Formula density Answer : (b)
Q.6
Percentage of free space in a body-centred cubic unit cell is ...[ CBSE 2008]
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a) 28%
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b) 30%
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c) 32%
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d) 34%
Explanation
Percentage occupied space in body centred cubic unit cell = 68% ∴ Percentage free space = 100-68 =32% Answer : (c)
Q.7
Assertion: Crystalline solids can cause X-ray to diffract Reason: Interatomic distance in crystalline solids is of the order of 0.1 nm [ AIIMS 2004]
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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
Mean distance between atoms is in the range of 0.25 nm Answer : (c)
Q.8
What is the coordination number of body centred cube? [ BHU 2003]
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a) 4
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b) 6
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c) 8
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d) 12
Explanation
The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. Answer : (c)
Q.9
A metallic element has a cubic lattice. Each edge of the unit cell 2Å. The density of the metal is 2.5gcm-The unit cells in 200g of the metal are ...[ CBSE 1994]
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a) 1×1024
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b) 1×1020
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c) 1×1022
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d) 1×1025
Explanation
Edge length of the unit cell =2Å=2×10-8 Volume of the unit cell =(2×10-8)3cm3 =8×10-24cm3 Mass of the unit cell =Volume × density = 8×10-24 ×2.5g No. of unit cells in 200g of the metal = Mass of metal /Mass of unit cell 200 / (8×10-24 ×2.5) = 1×1025 Second way We know that density Since number atom per unit cell Z = 4 Answer : (d)
Q.10
Schottky defect defines imperfection in the lattice structure of a ...[ AIIMS 2002]
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a) gas
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b) plasma
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c) liquid
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d) solid
Explanation
Answer : (d)
Q.11
For an ionic crystal general formula Ax and coordination number is 6, the value of radius ratio will be ...[ MPPMT 1993]
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a) greater than 0.73
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b) between 0.73 and 0.41
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c) between 0.41 and 0.22
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d) less than 0.22
Explanation
coordination number is 6, then ionic ratio is 0.414 - 0.732, the solid has rock salt type structure Answer : (b)
Q.12
A crystalline solid have
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a) Disordered arrangement
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b) Long range order
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c) Short range order
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d) None of these
Explanation
Answer: (b)
Q.13
Certain crystals produces electric signals on application of pressure. this phenomenon is called
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a) Pyroelectricity
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b) Ferroelectricity
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c) Piezoelectricity
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d) Ferrielectricity
Explanation
Piezoelectric substances produce electric signals when mechanical stress is applied to then Answer: (c)
Q.14
Which type of crystal defect is indicated in the diagram below [ AIEEE 2004]
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a) Frenkel defect
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b) Frenek and Schottky defect
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c) Interstitial defect
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d) Schottky defect
Explanation
Equal number of cations and anions are missing from the lattice, so it must be Schottky defect Answer:(d)
Q.15
Which of the following is not a ferroelectric compound
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a) Rochelle salt
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b) K4[Fe(CN)6]
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c) BaTIO3
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d) KH2PO4
Explanation
Answer: (b)
Q.16
he ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.Its coordination number is [ Karnataka CET 2003]
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a) 1
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b) 4
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c) 6
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d) 8
Explanation
Radius ratio falls in the range 0.732 - 1, thus coordination number must be 8 Answer: (d)
Q.17
How many number of atoms are present in fcc unit cell
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a) 4
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b) 3
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c) 2
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d) 1
Explanation
In fcc structure 8 atoms at corner and six at the centre of each face are present, the contribution will be 8 × (1/8) + 6 ×(1/2) = 4 atoms per unit cell Answer: (a)
Q.18
a and Mg crystallises in bcc and fcc type crystals, then the number of Na and Mg atoms present in the unit cell of their respective crystal is [ AIEEE 2002]
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a) 4 and 2
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b) 9 and 14
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c) 14 and 9
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d) 2 and 4
Explanation
In bcc, number of atoms per unit cell = 2 In fcc, number of atoms per unit cell = 4 Answer:(d)
Q.19
Bragg's law is given by equation
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a) nλ = 2θsinθ
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b) nλ = 2dsinθ
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c) 2nλ = dsinθ
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d) nλ = (d/2);sinθ
Explanation
Answer: (b)
Q.20
If the distance between Na+ and Cl- ions in sodium chloride crystal is X pm, the length of the edge of the unit cell is [ Kernatak CET 2004]
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a) 4X pm
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b) (X/4) pm
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c) (X/2) pm
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d) 2X pm
Explanation
In NaCl edge length a = 2 × distance between Na+ and Cl- = 2X Answer: (d)
Q.21
KBr shows which of the following defects?
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a) Frenkel defect
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b) Schottky defect
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c) Metal excess defect
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d) Metal deficiency
Explanation
Schottky defect is exhibited by the compound having high coordination number and the compounds in which have small difference in the size of cations and anions Answer: (b)
Q.22
Schottky defect generally appears in
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a) CsCl
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b) KCl
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c) NaCl
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d) All
Explanation
Schottky defect is most common in highly ionic compound with high coordination number and size of two ions ( cations and anions) are almost same Answer:(d)
Q.23
Which of the following expression is correct in case of a sodium chloride unit cell
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a) r+ + r- = a
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b) r+ + r- = a/2
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c) r+ + r- = 2a
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d) r+ + r- = a√2
Explanation
For any fcc 2(r+ + r-) = a or r+ + r- = a/2 Answer: (b)
Q.24
In a cubic unit cell, seven of eight corners are occupied by atom A and centres of faces are occupied by B. The general formula of the substance having this type of structure would be
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a) A7B6
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b) A7B24
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c) A7B12
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d) A7B36
Explanation
Number of A-atoms per unit cell = (1/8) ×7 = 7/8 A:B = (7/8) : 3 = 7 :24 Thus formula is A7B24 Answer: (b)
Q.25
In an antifluorite structure, cations occupy
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a) Octahedral voids
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b) Centre of cube
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c) Tetrahedral voids
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d) Corners of cube
Explanation
In antifluorite structure anions have a cubical close packed arrangement and cations occupy all tetralhedral voids Answer: (c)
Q.26
In a ferrimagnetic material
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a) All the magnetic moment vectors point in one direction
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b) All the magnetic moment vector are randomly oriented
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c) Contains equal number of magnetic moment vectors oriented in opposie direction
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d) Contain unequal number of magnetic moment vectors in opposite direction
Explanation
In a ferrimagnetic material, Contain unequal number of magnetic moment vectors in opposite direction such that the net magnetic moment of the substance is vey small Answer:(d)
Q.27
When NaCl crystal is doped with MgCl2, the nature of defect produced is
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a) Interstitial defect
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b) Schottky defect
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c) Frenkel defect
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d) None of these
Explanation
This is a type of ionic solid. Cationic vacancies developed due to introduction of impurity causes higher electrical conductivity of ionic solids Answer: (d)
Q.28
Copper crytalizes in fcc with unit cell length of 361 pm. What is the radius of copper atom? [ AIEEE 2009]
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a) 108 pm
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b) 127 pm
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c) 157 pm
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d) 181 pm
Explanation
Since Cu crystallizes in fcc lattice ∴ Radius of Cu atom, r = a/2√2 ( a = edge length) given a = 361 pm ∴ r = 361/2√2 = 127 pm Answer: (b)
Q.29
Which of the following does not exhibit Frenkel defect
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a) AgBr
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b) AgCl
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c) KBr
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d) ZnS
Explanation
Frenkel defect is exhibited by compound having low coordination number and compound having large difference in size of cation and anion. This defect is not found in alkali metal halides because cantion and anions have almost equal size and cations cannot be accommodated in interstitial sites Answer: (c)
Q.30
An element ( density = 7.2 g/cc) exists in the body centred cubic structure whose cell edge is 2.88 Ao. The number of atoms in 104 g of element is
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a) 2.0 × 1023
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b) 1.209 ×1024
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c) 2.418 ×1024
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d) 6.045 ×1023
Explanation
For bcc Z = 2 Answer: (b)
0 h : 0 m : 1 s
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