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NEET Chemistry MCQ
Solid State Mcq Neet Chemistry
Quiz 6
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Q.1
A particular solid is very hard and has a high melting point. In solid state, it is a non-conductor and its melt is a conductor of electricity. Classify the solid ...[ CMC Vellore 2008]
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a) metallic
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b) molecular
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c) ionic
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d) network
Explanation
Ionic solids are hard with high melting point. In molten state, these solids are good conductor of electricity because ions become free in molten state. Answer : (c)
Q.2
In a solid, oxide ions(O2-) are arranged in ccp, cations (A3+) occupy one-sixth of tetrahedral void and cations (B3+) occupy one third of the octahedral voids. What is the formula of the compound?
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a) ABO2
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b) ABO3
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c) AB2O3
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d) A2BO3
Explanation
For ccp Number of O2- ions in packing = n Number of octahedral voids = n Number of tetrahedral voids = 2n Given A3+ occupy one -sixth of tetrahedral void ∴ Number of A3+ = (1/6) × (2n) = n/3 Cation (B3+) occupy one-third of the octahedral voids. ∴ Number of B3+ = (1/3) × (n) = n/3 Answer : (b)
Q.3
The pyknometric density of sodium chloride crystal is 2.165×103 kg m-3 while its X-ray density is 2.178×103 kgm-the fraction of unoccupied sites in sodium chloride crystal is ...[ CBSE 2003]
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a) 5.96×10-1
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b) 5.96×10-3
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c) 5.96
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d) 5.96×10-2
Explanation
Fraction un-occupied = 1.0994 = 5.96×10-3 Answer : (b)
Q.4
The ability of a given substance to assume two or more crystalline structure is called ...[ Manipal 2005]
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a) polymorphism
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b) amorphism
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c) isomorphism
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d) isomerism
Explanation
Answer : (a)
Q.5
A compound is formed by elements A and B. This crystallizes in the cubic structure when atoms A are at the corner of the cube and atoms B are at the center of the body. The simple formula of the compound is ...[ DPMT 2009]
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a) A2
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b) AB4
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c) AB
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d) A2B
Explanation
Answer : (c)
Q.6
The major binding force of diamond, silicon and quartz is ...[ MEE 2002]
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a) electrostatic force
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b) covalent bond force
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c) non-covalent bond force
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d) van der Waals' force
Explanation
Answer : (b)
Q.7
An electron trapped in an anion cavity in a crystal is called ...
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a) Frenkel defect
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b) Schottky defect
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c) interstitial
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d) F-centre
Explanation
Answer : (d)
Q.8
The edge length of face-centred cubic cell of ionic substance is 508pm. If the radius of the cation is 110pm, the radius of an ion is ...
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a) 618pm
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b) 144pm
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c) 288pm
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d) 398pm
Explanation
For fcc unit cell Answer : (b)
Q.9
A solid compound contains X, Y and Z atoms in a cubic lattice with X atoms occupying the corners, Y atoms in the body centered position and Z atoms at the centre of the faces of the unit cell. What is the empirical formula of the compound
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a) XYZ
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b) XY2Z3
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c) X8YZ6
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d) XYZ3
Explanation
= 1 Number of atoms of Y in a unit a unit cell = Number of atoms of Z in a unit cell = (1/2) ×6 = 3 Empirical formula of the compound = ZYZ3 Number of atoms of X in a unit cell = (1/8) × Answer : (d)
Q.10
Assertion: Antiferromagnetic solids have a net magnetic moment Reason: MnO is an antiferromagnetic 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 is false but reason is true.
Explanation
Answer : (d)
Q.11
In a compound, atoms of element Y from ccp lattice and those of element X occupy 2/3rd tetrahedral voids. The formula of the compound will be
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a) X4Y3
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b) X2Y3
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c) X3Y4
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d) X2Y
Explanation
Let number of atoms of Y used in packing = n Number of tetrahedral voids = 2n Number of atoms of X = (2/3) × 2n = (4/3)n Y:X = n: 4n/3 = 3:4 Formula of compound = X4Y3 Answer : (a)
Q.12
The unit cell of Al(molar mass 27 g/mol) has an edge length of 405pm. Its density is 2.7g/cmThe cubic unit cell is ..
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a) face-centred
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b) body-centred
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c) primitive
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d) edge-centred
Explanation
Number of atoms per unit cell = Z Answer : (a)
Q.13
A metallic element has a cubic lattice. Each edge of the unit cell 2Å. The density of the metal is 2.5g/cmThe 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
Answer : (d)
Q.14
Assertion: Molecular solids have low melting point Reason: Molecular solids are composed of covalent molecules
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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.15
crystalline solid is made of two elements 'A' and 'B'. Atoms of 'A' are present at corners and atoms of 'B' at face-centres. One atom of 'A' is missing from a corner. The simplest formula of the solid will be ..
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a) A8B21
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b) AB3
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c) A7B3
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d) A7B24
Explanation
Atoms of 'A' present at7 corners ∴ Number of atoms of 'A' = 7 ×(1/8) = 7/8 Atom of 'B' are present at six face-centre ∴ Number of atoms of 'B' = 6 × (1/2) = 3 Answer : (d)
Q.16
A solid X+Y- has a bcc structure. If the distance of closest approach between the ions is 173 pm, the edge length of the cell is
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a) √2 pm
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b) (√3/2) pm
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c) 200 pm
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d) 400 pm
Explanation
In bcc distance closest approach = a(√3/2) 173 = a(√3/2) a ≈200 pm Answer : (c)
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