JEE Chemistry The Solid State MCQs Set B

Question. Frenkel and Schottky defects are :
(a) crystal defects
(b) nucleus defects
(c) non-crystal defects
(d) nuclear defects

Answer: A

Question. Equal number of atoms or ion missing from normal lattice point creating a vacancy due to
(a) Schottky defect
(b) Frenkel defect
(c) Mass defect
(d) Interstitial defect

Answer: A

Question. In stoichiometric defects, the types of compound exhibit Frenkel defects have/has
(a) Low co-ordination nos
(b) High co-ordination
(c) Small difference in the size of cations and anions
(d) None of these

Answer: A

Question. The crystal with metal deficiency defect is
(a) FeO
(b) ZnO
(c) NaCl
(d) KCl

Answer: A

Question. Which of the following has Frenkel defects?
(a) Silver bromide
(b) Sodium chloride
(c) Graphite
(d) Diamond

Answer: A

Question. Which of the following crystals does not exhibit Frenkel defect?
(a) KBr
(b) AgBr
(c) AgCl
(d) ZnS

Answer: A

Question. Due to Frenkel defect, the density of ionic solids
(a) does not change
(b) increases
(c) decreases
(d) None of these

Answer: A

Question. In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is
(a) Frenkel defect
(b) Interstitial defect
(c) Valency defect
(d) Schottky defect

Answer: A

Question. Doping of AgCl crystals with CdCl₂ results in
(a) Substitutional cation vacancy
(b) Formation of F - centres
(c) Schottky defect
(d) Frenkel defect

Answer: A

Question. Cations are present in the interstitial sites in ________.
(a) Frenkel defect
(b) Vacancy defect
(c) Schottky defect
(d) Metal deficiency defect

Answer: A

Question. What is the energy gap between valence band and conduction band in crystal of insulators
(a) Very large
(b) Infinite
(c) Very small
(d) Both the bands are overlapped with each other

Answer: A

Question. Which of the following is non stoichiometric defect?
(i) Metal excess defect (ii) Impurity defect
(iii) F-centre                 (iv) Metal deficiency defect
(a) (i), (iii) and (iv)
(b) All of these
(c) (i) and (iv)
(d) (iii) and (ii)

Answer: A

Question. Which kind of defects are introduced by doping ?
(a) Electronic defects
(b) Schottky defect
(c) Dislocation defect
(d) Frenkel defects

Answer: A

Question. Silicon doped with electron – rich impurity forms _______.
(a) n-type semiconductor
(b) p-type semiconductor
(c) intrinsic semiconductor
(d) insulator

Answer: A

Question. Which of the following defects is also known as dislocation defect ?
(a) Frenkel defect
(b) Schottky defect
(c) Non – stoichiometric defect
(d) Simple interstitial defect

Answer: A

Question. Doping of silicon (Si) with boron (B) leads to
(a) p-type semiconductor
(b) insulator
(c) n-type semiconductor
(d) metal

Answer: A

Question. On doping Ge metal with a little of In or Ga, one gets
(a) p-type semi conductor
(b) insulator
(c) n-type semi conductor
(d) rectifier

Answer: A

Question. With which one of the following elements silicon should be doped so as to give p-type of semiconductor ?
(a) Boron
(b) Arsenic
(c) Germanium
(d) Selenium

Answer: A

Question. To get a n- type semiconductor, the impurity to be added to silicon should have which of the following number of valence electrons
(a) 5
(b) 2
(c) 1
(d) 3

Answer: A

Question. If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
(a) n-type
(b) None of the two
(c) p-type
(d) None of these

Answer: A

Question. The addition of arsenic to germanium makes the latter a
(a) extrinsic semiconductor
(b) intrinsic semiconductor
(c) metallic conductor
(d) mixed conductor

Answer: A

Question. Pure silicon doped with phosphorus is a
(a) n-type semiconductor
(b) metallic conductor
(c) insulator
(d) p-type semiconductor

Answer: A

Question. Which of the folliowing metal oxides is anti-ferromagnetic in nature?
(a) MnO₂
(b) VO₂
(c) TiO₂
(d) CrO₂

Answer: A

Question. Which of the following compound is like metallic copper in its conductivity and appearance?
(a) ReO₃
(b) VO₃
(c) TiO₃
(d) CrO₂

Answer: A

Question. Magnetic moment of electron is due to which of the following reason?
(a) Both
(b) Due to its orbital motion around the nucleus
(c) Due to its spin around its own axis
(d) None of these

Answer: A

Question.  Which of the following type of substances can be permanently magnetised?
(a) Ferromagnetic
(b) Antiferromagnetic
(c) Diamagnetic
(d) Ferrimagnetic

Answer: A

Question. Which of the following statement is not correct?
(a) Ferromagnetic substances becomes paramagnetic on heating
(b) In antiferromagnetism domains are oppositely oriented and cancel out each other’s magnetic moment
(c) Diamagnetic substances are weakly magnetised in magnetic field in opposite direction
(d) Paramagnetic substances lose their magnetism in the absence of magnetic field

Answer: A

Question. An element containing an odd number of electrons is
(a) Paramagnetic
(b) Antiferromagnetic
(c) Diamagnetic
(d) None of these

Answer: A

Question. Which of the following oxides behaves as conductor or insulator depending upon temperature ?
(a) TiO₃
(b) TiO
(c) SiO₂
(d) MgO

Answer: A

Question. Which of the following oxides shows electrical properties like metals ?
(a) CrO₂
(b) MgO
(c) SiO₂
(d) SO₂ (s)

Answer: A

Question. Which of the following statements is not true ?
(a) Ferromagnetic substances cannot be magnetised permanently
(b) Paramagnetic substances are weakly attracted by magnetic field.
(c) The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
(d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances

Answer: A

Question. A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because ________.
(a) all the domains get oriented in the direction of magnetic field.
(b) all the domains get oriented in the direction opposite to the direction of magnetic field.
(c) domains get oriented randomly
(d) domains are not affected by magnetic field

Answer: A

Question. Which of the following statement(s) is/are correct?
(i) Crystalline solids have definite characteristic geometrical shape.
(ii) Crystalline solids have long range order.
(iii) Sodium chloride and quartz glass are examples of crystalline solids.
(iv) Crystalline solids are isotropic in nature
(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (i) only

Answer: A

Question. Which of the following sequence of T and F is correct for given statements. Here T stands for true statement and F stands for false statement?
(i) Ionic solids are electrical insulators in the solid state but conduct electricity in molten state.
(ii) Graphite is a covalent solid.
(iii) Covalent solids are conductor of electricity.
(iv) Non polar molecular solids are held by weak dispersion forces or London forces while polar molecular solids are held by stronger dipole - dipole interactions.
(a) TTFT
(b) FTTF
(c) TTTF
(d) TFTT

Answer: A

Question.  Which of the following statements(s) is/are incorrect?
(i) Only 1/8th portion of an atom located at corner of a cubic unit cell is its neighbouring unit cell.
(ii) Total number of atoms per unit cell for a face centered cubic unit cell is 3 .
(iii) Atom located at the body center is shared between two adjacent unit cells.
(a) (ii) and (iii)
(b) (ii) only
(c) (iii) only
(d) (i) and (ii)

Answer: A

Question. Which of the following is/are not true about the voids formed in 3 dimensional hexagonal close packed structure ?
(i) A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the first layer.
(ii) All the triangular voids are not covered by the spheres of the second layer.
(iii) Tetrahedral voids are fomed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangular shapes of these voids do not overlap.
(iv) Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar voids in the first layer.
(a) (iii) and (iv)
(b) (iv) only
(c) (i) and (iv)
(d) (ii) and (iii)

Answer: A

Question.  Which of the following sequence of T and F is true for given statements. Here T stands for true statement and F stands for false statement?
(i) Frenkel defect results in increase in density of the solid.
(ii) ZnS, AgCl, AgBr and AgI shows Frenkel defect.
(iii) Schottky defect results in decrease in density of the solid.
(iv) AgBr shows Schottky defect only.
(v) For NaCl there is one Schottky defect per 10¹⁶ ions.
(a) FTTFT
(b) TTTFT
(c) TTTFF
(d) FTTFF

Answer: A

Question. Which of the following sequence of T and F is correct? Here ‘T’ stands for true and ‘F’ stands for false statement.
(i) Solids have conductivities in the order of 10^–20 to 10⁷ ohm^–1 m^–1.
(ii) In semiconductors the gap between filled valence band and conduction band is small.
(iii) Electrical conductivity of insulators increases with rise in temperature.
(iv) Insulators have conductivities ranging between 10^–6 to 10⁴ ohm^–1 m^–1
(a) TTFF
(b) FTFF
(c) TTFT
(d) FTTF

Answer: A

Question.  White crystal of zinc oxide is heated
(i) Metal excess defect is created.
(ii) Crystal become p-type semiconductor
(iii) Crystal become yellow in color.
(iv) Free electron are created.
(a) (i), (ii) and (iv)
(b) (ii) and (iv)
(c) All statement(s) are correct
(d) (i), (ii) and (iii)

Answer: A

Question. Consider the Oxygen and chromium dioxide, both are placed in magnetic field:
(i) Oxygen is attracted strongly in a magnetic field.
(ii) Magnetic field persist in chromium dioxide while in Oxygen not.
(a) Statements (ii) is correct only.
(b) Both Statements are incorrect
(c) Both Statements are correct
(d) None of these

Answer: A

Question. Assertion : Crystalline solids have long range order.
Reason : Amorphous solids have short range order
(a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(b) Assertion is correct, reason is incorrect
(c) Assertion is incorrect, reason is correct
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion: Glass panes fixed to windows or panes of old buildings are found to be slightly thicker at the bottom.
Reason: Amorphous solids have a tendency to flow.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : In crystal lattice, the size of the tetrahedral hole is larger than an octahedral hole.
Reason : The cations occupy less space than anions in crystal packing
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : In close packing of spheres, a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres.
Reason : A tetrahedral void has a tetrahedral shape whereas an octahedral void has an octahedral shape
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not acorrect explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : The packing efficiency is maximum for the fcc structure.
Reason : The cordination number is 12 in fcc structures
(a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(b) Assertion is correct, reason is incorrect
(c) Assertion is incorrect, reason is correct
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : In any ionic solid (MX) with Schottky defects, the number of positive and negative ions are same.
Reason : Equal number of cation and anion vacancies are present.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Electrical conductivity of semiconductors increases with increasing temperature.
Reason : With increase in temperature, large number of electrons from the valence band can jump to the conduction band.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is incorrect, reason is correct
(d) Assertion is correct, reason is incorrect

Answer: A

Question. Assertion : On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason : The electrons change their spin on heating
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Which of the following type of solid has high melting point and do not conduct electricity but its aqueous solution and melt conduct electricity ?
(a) Ionic
(b) Metallic
(c) Covalent
(d) Molecular

Answer: A

Question. A group 1 hydride crystal when heated in presence of itsconstituent metal vapour shows pink color. This metal can be
(a) Li
(b) K
(c) Na
(d) Rb

Answer: A

Question. A solid with high electrical and thermal conductivity is
(a) Li
(b) Ice
(c) Si
(d) NaCl

Answer: A

Question. Which of the following is true about the value of refractive index of quartz glass ?
(a) Same in all directions
(b) Different in different directions
(c) Cannot be measured
(d) Always zero

Answer: A

Question. Which of the following features are not shown by quartz glass ?
(i) This is a crystalline solid.
(ii) Refractive index is same in all the directions.
(iii) This has definite heat of fusion.
(iv) This is also called super cooled liquid
(a) (i) and (iii)
(b) (i), (ii) and (iv)
(c) (iii) and (iv)
(d) (iii) only

Answer: A

Question. The number of carbon atoms per unit cell of diamond unit cell is
(a) 8
(b) 1
(c) 6
(d) 4

Answer: A

Question. Na and Mg crystallize in bcc and fcc type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is
(a) 2 and 4
(b) 9 and 14
(c) 4 and 2
(d) 14 and 9

Answer: A

Question. In a cubic lattice A atom occupy all the corners. If B atom occupy one of the opposite face, and atom C occupy the remaining faces. The simplest formulae of the compound is
(a) ABC₂
(b) AB₂C
(c) ABC₃
(d) ABC

Answer: A

Question. A solid has a structure in which ‘W’ atoms are located at the corners of a cubic lattice ‘O’ atoms at the centre of edges and Na atoms at the centre of the cube. The formula for the compound is
(a) NaWO₃
(b) Na₂WO₂
(c) NaWO₂
(d) None of these

Answer: A

Question. Potassium crystallizes with a
(a) body-centred cubic lattice
(b) face-centred cubic lattice
(c) simple cubic lattice
(d) orthorhombic lattice

Answer: A

Question. In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3^rd of tetrahedral voids. The formula of the compound will be
(a) X₄Y₃
(b) X₂Y₃
(c) X₂Y
(d) None of these

Answer: A

Question. A substance A_xB_y crystallizes in a face centred cubic (fcc) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of the substance A_xB_y
(a) AB₃
(b) A₄B₃
(c) A3_B
(d) None of these

Answer: A

Question. In which of the following structures coordination number for cations and anions in the packed structure will be same?
(a) Cl^– ion form fcc lattice and Na⁺ ions occupy all octahedral voids of the unit cell
(b) S^2– ions form fcc lattice and Zn²⁺ ions go into alternate tetrahedral voids of the unit cell.
(c) Both
(d) None of these

Answer: A

Question. Packing efficiency by arrangement of atoms in two dimensional hexagonal close packing is
(a) 60.43
(b) 65.78
(c) 68.76
(d) 59.78

Answer: A

Question.  Edge length of unit cell is 3.608 × 10^–8 cm, which crystallizes in fcc and is determined to have a density of 8.92 g/cm³. The mass of four atoms is
(a) 1.67 × 10^–21
(b) 8.37 × 10^–22
(c) 4.18 × 10^–22
(d) 2.09 × 10^–22

Answer: A

Question. The edge length of unit cell of a metal having molecular weight 75 g/mol is 5Å which crystallizes in cubic lattice. If the density is 2g/cc then find the radius of metal atom. (N_A = 6 × 10²³). Give the answer in pm.
(a) 217 pm
(b) 220 pm
(c) 210 pm
(d) 205 pm

Answer: A

Question. The number of atoms in 100 g of an fcc crystal with density, d = 10 g/cm³ and cell edge equal to 100 pm, is equal to
(a) 4 × 10²⁵
(b) 2 × 10²⁵
(c) 1 × 10²⁵
(d) 3 × 10²⁵

Answer: A

Question. A metallic element exists as cubic lattice. Each edge of the unit cell is 2.88 Å. The density of the metal is 7.20 g cm^–3. How many unit cell will be present in 100 g of the metal?
(a) 5.82 × 10²³
(b) 2.12 × 10⁶
(c) 6.85 × 10²
(d) 4.37 × 10⁵

Answer: A

Question. A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm^-3. The molar mass of the metal is : (N_A Avogadro’s constant = 6.02 × 10²³ mol^–1)
(a) 27 g mol^–1
(b) 40 g mol^–1
(c) 30 g mol^–1
(d) 20 g mol^–1

Answer: A

Question. Al (at. wt 27) crystallizes in the cubic system with a cell edge of 4.05 Å . Its density is 2.7 g per cm³ . Determine the unit cell type calculate the radius of the Al atom
(a) fcc, 1.432 Å
(b) bcc, 2.432 Å
(c) fcc, 2.432 Å
(d) bcc, 1.432 Å

Answer: A

Question. A compound is formed by elements A and B. The crystalline cubic structure has the A atoms at the corners of the cube and B atoms at the body centre. The simplest formula of the compound is
(a) A₆B
(b) A₈B₄
(c) AB
(d) AB₆

Answer: A

Question. What type of semiconductors respectively are formed when the group 14 are doped with the group 13 and group 15
(a) p,n
(b) p,p
(c) n,p
(d) n,n

Answer: A

Question. Which of the following is ferroelectric compound?
(a) BaTlO₃
(b) Pb₂O₃
(c) None of these
(d) Both

Answer: A

Question. Substance which is weakly repelled by a magnetic field is
(a) H₂O
(b) Fe₃O₄
(c) O₂
(d) CrO₂

Answer: A

Question. Which one of the following statements is correct?
(a) Ferrimagnetic substance like ZnFe₂O₄ becomes paramagentic on heating
(b) MnO is an example of ferromagnetic substance
(c) CuSO₄ is a diamagnetic salt
(d) NaCl is a paramagnetic salt

Answer: A

Question. Which of the following is true about the charge acquired by p-type semiconductors ?
(a) neutral
(b) positive
(c) negative
(d) depends on concentration of p impurity

Answer: A