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Solid State Mcq Neet Chemistry
Quiz 3
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Q.1
An electron trapped in an anion site in crystal is called
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a) F-centre
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b) Frenkel defect
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c) Schottky defect
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d) Interstitial defect
Explanation
F-centre are electrons trapped anion site which are responsible for colour Answer: (a)
Q.2
How many unit cells are present in a cube shaped ideal crystal of NACl of mass 1.0g? [ AIEEE 2003]
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a) 2.57 × 1021 unit cells
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b) 5.14 × 1021 unit cells
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c) 1.28 × 1021 unit cells
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d) 1.71 × 1021 unit cells
Explanation
Mass of one unit cell = Each unit cell consists of 4 NaCl unit Mass of one unit cell = Mass of one NaCl unit × Number of NaCl units present Mass of unit cell = Number of unit cells = 1g/ mass of one unit cell Number of unit cells = Answer: (a)
Q.3
Empty space in ccp lattice is
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a) 26%
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b) 45%
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c) 90%
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d) 30%
Explanation
Answer:(a)
Q.4
Gold has a close-packed structure which can be viewed as spheres occupying 0.74 of the total volume. What is the radius of gold ion if density of gold is 19.3 g/cc? ( Au = 197 amu)
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a) 1.439 ×10-8 cm
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b) 4.07 × 10-8 cm
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c) 1.017 ×10-8 cm
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d) 8.23 ×10-8 cm
Explanation
0.74 occupancy of the total volume shows that it has a face centred cubic cll , Z = 4 Form formula for density ρ Answer: (a)
Q.5
The ability of a given substance to assume two or more crystalline structure is called
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a) Polymorphism
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b) Isomorphism
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c) Amorphism
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d) Isomerism
Explanation
Answer: (a)
Q.6
Which of the following metal oxide is antiferromagnetic in nature [ MP CET 2002]
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a) MnO2
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b) TiO2
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c) NO2
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d) CrO2
Explanation
Answer: (a)
Q.7
In a solid lattice the cation and anion both have left a lattice site. The lattice defect is known as
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a) Interstitial defect
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b) Valency defect
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c) Frenkel defect
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d) Schottky defect
Explanation
Answer:(d)
Q.8
Ionic solids with Schottky defects contain in their structure
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a) Equal number of caation and anion vacancies
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b) Interstitial anions and anion vacancies
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c) Cation vacancies only
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d) Cation vacancies and interstitial cations
Explanation
In Schottky defect equal number of cations and anions are missing from lattice, so that equal number of cation and anion vacancies are produced Answer: (a)
Q.9
Total volume of atoms present in face centred cubic unit cell of metal is ( r atomic radius)
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a) (20/3) π r3
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b) (24/3) π r3
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c) (12/3) π r3
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d) (16/3) π r3
Explanation
In case of fcc, since four atoms are present in a unit cell., hence volume Answer: (d)
Q.10
In a feromagnetic material
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a) All the magnetic moment vectors are aligned in one direction
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b) Half of the magnetic moment vectors point in one direction and rest in the opposite direction
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c) All the magnetic moment vectors are randomly oriented
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d) Is characterised by small magnetic moment
Explanation
In a feromagnetic material, all the magnetic moment vectors are aligned in one direction such that these substances show magnetic properties even in the absence of external magnetic field Answer: (a)
Q.11
An ionic compound has unit cell consisting of A ions at the corners of cube and B ions on the centres of the faces of the cube. The empirical formula of this compound would be [ AIEEE 2005]
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a) AB3
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b) A3B
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c) AB
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d) A2B
Explanation
Number of A-ions per unit cell = (1/8) × 8 = 1 Number of B-ions per unit cell = (1/2) × 6 =3 A:B = 1:3 Thus, formula of compound = AB3 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
In frenkel defect, cations(few) occupy interstitial site Answer : (c)
Q.13
Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius) [ JIPMER 2008]
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a)
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b)
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c)
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d)
Explanation
Number atom per unit cell of fcc Z = 4 ∴ Occupied volume = Z × volume of atom option a is correct Answer : (a)
Q.14
Assertion: Graphite is soft while diamond is hard Reason: Graphite has three dimensional structure while diamond has planar [ 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
Answer : (c)
Q.15
Which one of the following is a covalent solid?
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a) Fe
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b) Cu
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c) Sodium chloride
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d) Diamond
Explanation
Answer : (d)
Q.16
If the alignment of magnetic moments in a substance is in a compensatory way so as to give zero net magnetic moment, then the substance is said to be ...
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a) ferromagnetic
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b) anti-ferromagnetic
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c) ferrimagnetic
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d) diamagnetic
Explanation
Answer : (b)
Q.17
In a solid, oxide ions are arranged in ccp. Cation 'A' occupy one-sixth of the tetrahedral voids and cations 'B' occupy one-third of the octahedral voids. The formula of the compound is ...
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a) A2BO3
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b) AB2O3
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c) ABO3
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d) A2O2O3
Explanation
Face Centered Cubic (fcc). or. Cubic Close Packed (ccp). These are two different names for the same lattice. Thus oxide ions contribution = 8×(1/8) + 6 ×(1/2) = 4 No. of tetrahedral voids = 4 × 2 = 8 Tetrahedral voids occupied by 'A' = 8/6 = 4/3 Number of octahedral voids = 4×1 =4 Octahedral voids occupied by 'B' = 4/3 Thus, the formula is ABO3 Answer : (c)
Q.18
If we know the ionic radius in crystal of ionic solid, which of the following can be known?
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a) Magnetic property
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b) Nature of chemical bond
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c) Type of defect
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d) Geometry of crystal
Explanation
The use of ionic radii to predict aspects of crystal structure like lattice parameters, the lengths of the axes of the unit cells, is often useful, but only when the values of the ionic radii are taken form the same source, i.e. they use the same reference ion and so have the correct relative sizes. Answer : (d)
Q.19
An alloy of Cu, Ag and Au is found to have copper constituting 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) CuAgAu
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b) Cu4Ag4Au
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c) Cu4Ag2
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d) Cu4Ag3Au
Explanation
In ccp arrangement, Cu atoms occupy the corners and face-centres Number of Cu atoms = 8×(1/8) + 6×(1/2) = 4 Number of silver atoms = Number of edge centre × (1/4) Number of silver atoms = 12×(1/4) = 3 Number of gold atoms = 1 ( at body centre) × Formula of alloy = Cu4Ag3Au Answer : (d)
Q.20
Schoottky defect is crystals is observed when ...[ CBSE 1998]
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a) an ion leaves its normal site and occupies an interstitial site
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b) unequal number of cations and anions are missing from the lattice
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c) density of the crystal is increased
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d) equal number of cations and anions are missing from the lattice
Explanation
Answer : (d)
Q.21
The cohesive force involved in ice is ..
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a) hydrogen bonding
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b) electrostatic
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c) van der Waal's force
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d) covalent network
Explanation
Each molecule of water is involved in the hydrogen bonding with three other molecules Answer : (a)
Q.22
What is the coordination number of sodium in Na2O? [ AIIMS 2003]
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a) 2
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b) 4
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c) 6
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d) 8
Explanation
Na2O has antifluorite structure. Coordination number of cation and anion will be 4:8 Na+ ion is surrounded by four oxide ions and O2- is surrounded by eight Na+ ions hence coordination number of Na is 4 Answer : (b)
Q.23
The number of atoms in one unit cell of a face-centered cubic lattice is ...[ BHU 1998]
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a) 2
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b) 3
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c) 4
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d) 5
Explanation
Answer : (c)
Q.24
Assertion: An ccp arrangement, a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres Reason: Size of tetrahedral void is smaller than that of octahedral void
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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 : (b)
Q.25
In compound XY2O4, oxide ions are arrangement in ccp anad cations X are present in octahedral voids. Cation Y are equally, distributed among octahedral and tetrahedral voids. the fraction of the octahedral voids occupied is
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a) 1/2
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b) 1/4
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c) 1/6
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d) 1/8
Explanation
Number of Oxide ion in ccp = 4 Number of tetrahedral void = 8 Number of octahedral void = 4 Number of octahedral void occupied by X = 1 Number of Y are 2 Given that Y occupy tetrahedral and octahedral equally Thus number of Y in tetrahedral void is = 1 Thus out of Number of void available 4, 2 are occupied one by X and one by Y Thus 2/4 = 1/2 fraction of octahedral voids are occupied Answer : (a)
Q.26
In a closed packed array of N spheres, the octahedral holes are ...
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a) N/2
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b) 2N
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c) 4N
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d) N
Explanation
Answer : (d)
Q.27
A solid compound contains X, Y and Z atoms in a cubic lattice with X atoms occupying the corners, Y atoms in the body centred position and Z atoms at the centres of faces of unit cell. What is the empirical formula of the compound?
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a) Z8YZ6
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b) XYZ3
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c) XY2Z3
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d) X2Y2Z3
Explanation
X: is at the corner number of atoms = 8 × (1/8) = 1 Y: is at body position : 1 Z is at face centre = 6× 1/2 = 3 XYZ3 Answer : (b)
Q.28
Which of the following statement is not correct? [ CBSE 2008]
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a) The number of carbon atoms in a unit cell of diamond is 4
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b) The number of Bravis lattices in which a crystal can be categorized is 14
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c) The fraction of the total volume blank by the atoms in a primitive cell is 0.48
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d) Molecular solids are generally volatile
Explanation
Carbon have fcc structure similar to ZnS ,and 4 tetrahedral voids occuped by carbon. Number of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8. Since each carbon atom is surrounded by four more carbon atoms, the co-ordination number is 4. Molecular solids are soft, often volatile, have low melting temperatures, and are generally less volatile. Answer : (d)
Q.29
Which of following is not correct about ZnS?
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a) S2- ions are present in ccp arrangement
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b) Zn2+ ions occupy half of the tetrahedral voids
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c) Octahedral voids are empty
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d) Coordination number of Zn2+ ion is 6
Explanation
ZnS occurs in two common polytypes, zincblende (also called sphalerite) and wurtzite. The two types have these features in common: a 1:1 stoichiometry of Zn:S. a coordination of 4 for each ion (4:4 coordination) Answer : (d)
Q.30
Assertion: The effusion rate of oxygen is smaller than that of nitrogen Reasons: Molecular size of nitrogen is smaller than that of oxygen ...[ 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
Molecular size of Nitrogen is greater than molecular size of Oxygen Answer : (c)
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