NEET Chemistry The Solid State MCQs Set A

Question:  Which of the following crystal is represented by a ≠ b ≠ c and α≠β≠γ≠90°?

• a) Orthorhombic
• b) Monoclinic
• c) Triclinic
• d) Tetragonal

Answer: Triclinic

Question: Copper belongs to a crystal system represented by the crystal dimensions as

• a) α = β = γ = 90º, a = b = c 
• b) α ≠ β ≠ γ, a = b = c
• c) α = β = 90º, γ ≠ 90º, a = b = c 
• d) α = β = γ= 90º, a ≠ b ≠ c

Answer:  α = β = γ = 90º, a = b = c 

Question: What is the relation between diamond and graphite?

• a) Polymorphous
• b) Isomer
• c) Isotope
• d) Isomorphous

Answer: Polymorphous

Question: Maximum possible numbers of two dimensional and three dimensional lattices are respectively

• a) 5 and 14
• b) 7 and 14
• c) 14 and 4
• d) 5 and 13

Answer: 5 and 14

Question: A compound formed by element A and B crystallizes in the cubic structure, where A atoms are at the corners of a cube and B atoms are at the centre of the body. The formula of the compounds is

• a) AB
• b) AB₂ 
• c) A₂B₃
• d) AB₃

Answer: AB

Question:  A solid with formula ABC₃ would probably have

• a) A at body centre, B at face centres and C at corners of the cube
• b) A at corners of cube, B at body centre, C at face centre
• c) A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell
• d) A at corner, B at face centre, C at body centre

Answer: A at corners of cube, B at body centre, C at face centre

Question:  A solid ABC has A, B and C arranged as below. The formula of solid is

• a) ABC
• b) AB₂C₂
• c) A₂BC
• d) AB₈C₂

Answer: ABC

Question: 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 a formula

• a) Cu₄Ag₂Au
• b) Cu₄Ag₄Au 
• c) Cu₄Ag₃Au
• d) CuAgAu

Answer:  Cu₄Ag₃Au

Question: In a face centred cubic arrangement of A and B atoms, atoms of A are at the corner of the unit cell and atoms of B are at the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is

• a) A₇B₃ 
• b) AB₃  
• c) A₇B₂₄
• d) A_7/8B₃

Answer:  A₇B₂₄

Question: In any ionic crystal A has formed cubical close packing and B atoms are present at every tetrahedral voids.If any sample of crystal contain ‘N’ number of B atoms then number of A atoms in that sample is

• a) N
• b) N/2
• c) 2 N
• d) √2 N

Answer:  N/2

Question:  A binary solid A⁺B^– has a structure with B^– ions constituting the lattice and A⁺ ions occupying 25% tetrahedral holes. Formula of the solid is

• a) A₂B
• b) AB
• c) AB₂
• d) AB₄

Answer:  AB₂

Question: In a crystalline solid anions B are arranged in cubic close packing. Cation A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, the formula for the solid is

• a) AB
• b) AB₂
• c) A₂B
• d) A₂B₃

Answer:  A₂B

Question:  In a cubic close packed structure of mixed oxides, the lattice is made up of oxide ions, one-eighth of tetrahedral voids are occupied by divalent (X²⁺) ions, while one-half of the octahedral voids are occupied by trivalent ions (Y³⁺), then the formula of the oxide is

• a) XY₂O₄ 
• b) X₂YO₄
• c) X₄Y₅O₁₀
• d) X₅Y₄O₁₀

Answer:  XY₂O₄ 

Question: Titanium crystallizes in a face centred cubic lattice. It reacts with carbon or hydrogen interstitially by allowing atoms of these elements to occupy holes in the host lattice. Hydrogen occupies tetrahedral holes but carbon occupies octahedral holes the formula of titanium carbide and hydride are

• a) TiC₂, TiH₄ 
• b) TiC, TiH₂
• c) Ti₃C, TiH₂ 
• d) TiC₂, TiH

Answer: TiC, TiH₂

More Questions...........................................

Question:  The site labelled as ‘X’ in fcc arrangement is

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: A unit cell is obtained by closed packing layers of atoms in ABAB....... pattern. The total number of tetrahedral and octahedral voids in the unit cell are respectively

• a) 6, 12
• b) 8, 4
• c) 4, 8
• d) 12, 6

Answer: 12, 6

Question: In certain solid, the oxide ions are arranged in ccp. Cations A occupy 1/6 of the tetrahedral voids and cations B occupy one-third of the octahedral voids. The probable formula of the compound is

• a) ABO₃
• b) AB₂O₃  
• c) A₂BO₃
• d) A₂B₂O₃  

Answer:  ABO₃

Question: A solid has a structure in which A atoms are located at the cube corners of the unit cell, B atoms are located at the cube edges of unit cell and the C atoms at the body centre. Formula of the compound

• a) CAB₃
• b) C₂AB₃
• c) CA₃B
• d) C₂A₃B

Answer:  CAB₃

Question: If ‘a’ is the length of unit cell, then which one is correct relationship?

• a)

  

• b)

  

• c)

  

• d) All of these

Answer: All of these

Question: For face centered cubic structure edge length ‘a’ can be related with radius ‘r’ as

• a)

  

• b) a = r
• c)

  

• d)

  

Answer:

Question: A crystalline solid AB adopts sodium chloride type structure with edge length of the unit cell as 745 pm and formula mass of 74.5 a.m.u. The density of the crystalline compound is

• a) 2.16 g cm^–3 
• b) 0.99 g cm^–3
• c) 1.88 g cm^–3
• d) 1.197 g cm^–3

Answer:  1.197 g cm^–3

Question: If radius of an octahedral void is r and atomic radius of atoms assuming cubical close packing is R. Then the relation between r and R is

• a) r = 2R
• b) r = 1.414 R
• c) r = 0.414 R
• d)

  

Answer: r = 0.414 R

Question:  CsCl crystallises in a cubic cell that has a Cl^– at each corner and Cs⁺ at the centre of the unit cell. If radius of Cs⁺ is 1.69 Å and  r_Cl^– =1.81 Å, what is the edge length of unit cell?

• a) 3.50 Å
• b) 4.04 Å 
• c) 2.02 Å
• d) 1.01 Å

Answer:  4.04 Å 

Question:  Ice crystallises in a hexagonal lattice having the volume of unit cell as 132 × 10^–24 cm³. If density is 0.92 gcm^–3 at a given temperature, then number of H₂O molecules per unit cell is

• a) 1
• b) 2
• c) 3
• d) 4

Answer: 4

Question:  For tetrahedral co-ordination, the radius ratio (r₊/r_–) should be

• a) 0.414 – 0.732
• b) 0.732 – 1.0
• c) 0.156 – 0.225
• d) 0.225 – 0.414

Answer: 0.225 – 0.414

Question:  The radius of the Na⁺ is 95 pm and that of Cl^– ion is 181 pm. The co-ordination number of Na⁺ will be

• a) 4
• b) 6
• c) 8
• d) Unpredictable

Answer: 6

Question:  Lithium metal has a body centred cubic structure. Its density is 0.53 g cm^–3 and its molar mass is 6.94 g mol^–1. Calculate the edge length of a unit cell of Lithium metal

• a) 153.6 pm
• b) 351.6 pm
• c) 527.4 pm
• d) 263.7 pm

Answer: 351.6 pm

Question:  What is the volume of a face centred cubic unit cell, when its density is 2.0 g cm^–3 and the molar mass of the substance is 60.23 g mol^–1?

• a) 4 × 10^–22 cm³
• b) 2 × 10^–22 cm³ 
• c) 44 × 10^–22 cm³ 
• d) 22 × 10^–22 cm³

Answer:  2 × 10^–22 cm³ 

Question: The number of octahedral sites in a cubical close pack array of N spheres is

• a) N/2
• b) 2 N
• c) 4 N
• d) N

Answer: N

Question:  For a solid with the following structure, the coordination number of the point B is

• a) 3
• b) 4
• c) 5
• d) 6

Answer: 6

Question:  The empty space between the shaded balls and hollow balls as shown in the diagram is called

• a) Hexagonal void
• b) Octahedral void
• c) Tetrahedral void
• d) Double triangular void

Answer: Octahedral void

Question:  A mineral having formula AB₂ crystallises in the cubic close packed lattice, with the A atoms occupying the lattice points. Hence coordination number of A and B atoms are

• a) 4, 8
• b) 4, 4
• c) 8, 8
• d) 8, 4

Answer: 8, 4

Question:  KF has NaCl type of structure. The edge length of its unit cell has been found to be 537.6 pm. The distance between K⁺ F^– in KF is

• a) 26.88 pm
• b) 268.8 pm
• c) 2688 pm
• d) Unpredictable

Answer: 268.8 pm

Question: Which of the following features is false regarding the structure of CsCl?

• a) It has bcc arrangements
• b) For each ion coordination number is 8
• c) For each ion coordination number is 6
• d) The radius ratio (r₊/r_–) is 0.93

Answer: For each ion coordination number is 6

Question: Which type of solids will have the highest melting point?

• a) Ionic crystals
• b) Network covalent solid
• c) Molecular solids
• d) Metallic crystals

Answer: Network covalent solid

Question:  The mass of unit cell of Na₂O is

• a) Twice the formula mass of  Na₂O 
• b) Four times the formula mass of  Na₂O
• c) Six times the formula mass of  Na₂O 
• d) Thrice the formula mass of  Na₂O

Answer:  Four times the formula mass of  Na₂O

Question:  In normal spinel structure there is a closed packed array of O^2– ions. The trivalent cations are present in

• a) 75% of octahedral voids
• b) 50% of octahedral voids
• c) 12.5% of tetrahedral voids
• d) 25% of octahedral voids

Answer: 50% of octahedral voids

Question: The C–C and Si–C interatomic distances are 154 pm and 188 pm. The atomic radius of Si is

• a) 77 pm
• b) 94 pm
• c) 114 pm
• d) 111 pm

Answer: 111 pm

Question:  What is the coordination number of Rb⁺ in RbBr unit cell if ionic radii of Rb⁺ and Br^– ions being 148 and 195 respectively?

• a) 6
• b) 4
• c) 8
• d) 12

Answer: 8

Question:  A crystalline solid AB has NaCl type structure with radius of B^– ion is 250 pm. Which of the following cation can be made to slip into tetrahedral site of crystals of A⁺B^– ?

• a) P⁺ (radius = 180 pm) 
• b) Q⁺ = (radius = 56 pm)
• c) R⁺ = (radius = 200 pm)
• d) S⁺ = (radius = 150 pm

Answer:  Q⁺ = (radius = 56 pm)

Question: An element crystallises in a ‘bcc’ lattice. Nearest neighbours and next nearest neighbours of the elements are respectively

• a) 8, 8
• b) 8, 6
• c) 6, 8
• d) 6, 6

Answer: 8, 6

Question: The total number of elements of symmetry in a cubic crystal is

• a) 9
• b) 23
• c) 10
• d) 14

Answer: 23

Question: Number of formula units in unit cell of MgO (rock salt), ZnS (zinc blende) and Pt (fcc) respectively

• a) 4, 3, 2
• b) 4, 3, 4
• c) 4, 4, 4
• d) 4, 3, 1

Answer: 4, 4, 4

Question: A crystal may have one or more planes of symmetry as well as one or more than one axis of symmetry but it has

• a) Two centres of symmetry
• b) Only one centre of symmetry
• c) No centre of symmetry
• d) Three centres of symmetry

Answer: Only one centre of symmetry

Question: Which of the following statement is correct?

• a) On increasing temperature the coordination number of solid remains unchanged
• b) On increasing pressure the coordination number of solid increases
• c) On increasing temperature the coordination number of solid increases
• d) On increasing pressure the coordination number of solid decreases

Answer: On increasing pressure the coordination number of solid increases

Question: Zinc oxide on heating changes to yellow. This is because

• a) Zinc oxide is a stoichiometric compound
• b) Zinc oxide is a covalent compound
• c) Zinc oxide shows metal excessive defect
• d) It shows metal deficiency defect

Answer: Zinc oxide shows metal excessive defect

Question: Pyroelectric crystals produce feeble electric current

• a) On deformation
• b) On dissolving in a solvent
• c) On heating
• d) On sublimation

Answer: On heating

Question: F-centres in an ionic crystals are

• a) Lattice sites containing electrons
• b) Interstitial sites containing electrons
• c) Lattice sites that are vacant
• d) Interstitial sites containing cations

Answer: Lattice sites containing electrons

Question: Antiferromagnetic property is given as

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: When an element of group 14 is doped with an element of group 15

• a) p-type of semi-conductors are formed
• b) n-type of semi-conductors are formed
• c) Zeolites are formed
• d) Electrolytes are formed

Answer: n-type of semi-conductors are formed

Question: Substances which are magnetic but having less magnetic moment than theoretically calculated value are called

• a) Ferromagnetic
• b) Ferrimagnetic
• c) Antiferromagnetic
• d) Diamagnetic

Answer: Ferrimagnetic

Question: In antiferromagnetism

• a) Alignments of magnetic moments is additive
• b) Alignments of magnetic moments in one direction is compensated by alignments in the opposite directions
• c) Alignments of magnetic moments does not take place
• d) Alignments of magnetic moments varies with the nature of the material

Answer: Alignments of magnetic moments in one direction is compensated by alignments in the opposite directions

Question: Which is true about Piezoelectric crystals?

• a) They produce an electric current on heating
• b) They produce an electric current when a mechanical stress is applied
• c) They are insulators
• d) They are magnetic in nature

Answer: They produce an electric current when a mechanical stress is applied

Question: When a crystal having rock salt type geometry is heated in the presence of it’s metal vapour then defect in it will be

• a) Stoichiometric defect
• b) Metal excess defect
• c) Anion excess defect
• d) Frenkel defect

Answer: Metal excess defect

Question:  The mass percentage of Fe³⁺ ion present in Fe_0.93O_1.00 is

• a) 15%
• b) 5.5%
• c) 10.0%
• d) 11.5%

Answer: 11.5%

Question:  If 1 mole of NaCl is doped with 10^–3 mole of SrCl₂ . What is the number of cationic vacancies per moe of NaCl?

• a) 10^–3 mole^–1
• b) 6.02 × 10¹⁸ mole^–1
• c) 10⁵⁰ mole^–1
• d) 6.02 × 10²⁰ mole^–1

Answer:  6.02 × 10²⁰ mole^–1

Question: In crystalline solids, which of the following element of symmetry is not present?

• a) Axis of symmetry
• b) Angle of symmetry
• c) Centre of symmetry
• d) Plane of symmetry

Answer: Angle of symmetry

Question: Amorphous solids have

• a) Orderly arrangement of atoms
• b) Repeating unit of unit cell
• c) Long range of melting point
• d) Anisotropy

Answer: Long range of melting point

Question:  Which of the following is incorrect statement about the Bragg’s equation nλ = 2d sinθ ?

• a) n, represents order of reflection
• b) λ, represents wavelength of X-rays used
• c) θ, represents angle of glance 
• d) d, represents distance between two parallel planes

Answer:  θ, represents angle of glance 

Question:  The type of crystal system shown is

• a) Cubic
• b) Orthorhombic
• c) Monoclinic
• d) Tetragonal

Answer: Tetragonal