Chemistry Class 12

Chemistry Class 12 Chapter 1

Solid State Objective Questions

  1. Which one of the following is non-crystalline or amorphous?

(a) Diamond

(b) Graphite

(c) Glass

(d) Common Salt

Ans (c)

  1. NaCl typecrystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying

(a) high temperature

(b) high pressure

(c) high temperature and high pressure

(d) low temperature and low pressure

Ans (b)

  1. How many chloride ions are surrounding sodium ion in sodium chloride crystal ?

(a) 4

(b) 8

(c) 6

(d) 12

Ans (c)

  1. In NaCl structure

(a) all octahedral and tetrahedral sites are occupied

(b) only octahedral sites are occupied

(c) only tetrahedral sites are occupied

(d) neither octahedral nor tetrahedral sites are occupied

Ans (b)

  1. In Zinc blende structure

(a) zinc ions occupy half of the tetrahedral sites

(b) each Zn2- ion is surrounded by six sulphide ions

(c) each S2- ion is surrounded by six Zn2+ ions

(d) it has fee structure

Ans (c)

  1. A unit cell of BaCl2(fluorite structure) is made up of

(a) four Ba2+ ions and four Cl ions

(b) four Ba2- ions and eight Cl ions

(c) eight Ba² ions and four Cl ions

(d) four Ba² ions and six Cl ions

Ans (b)

  1. Alkali halids do not show Frenkel defect because

(a) cations and anions have almost equal size

(b) there is a large difference in size of cations and anions

(c) cations and anions have low coordination number

(d) anions cannot be accommodated in voids

Ans (a)

  1. The coordination number of Y will be in the XY types of crystal:

(a) 6

(b) 8

(c) 12

(d) 4

Ans (a)

  1. Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order

(a) 287 pm

(b) 574 pm

(c) 124.27 pm

(d) 143.5 pm

Ans (c)

  1. The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is

(a) 110 pm

(b) 220 pm

(c) 285 pm

(d) 144 pm

Ans (d)

  1. The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1will be

(a) 10 g cm-3

(b) 14.2 g cm-3

(c) 6.15 g cm-3

(d) 9.3 2 g cm-3

Ans (c)

  1. How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 g cm-3? (Atomic mass of Li = 6.94):

(a) 2

(b) 1

(c) 4

(d) 6

Ans (a)

  1. The distance between Naand Cl ions in NaCl with a density 2.165 g cm-3 is

(a) 564 pm

(b) 282 pm

(c) 234 pm

(d) 538 pm

Ans (b)

  1. An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is

(a) 10.37 g cm-3

(b) 5.19 g cm-3

(c) 7.29 g cm-3

(d) 2.14 g cm-3

Ans (b)

  1. Fe3O4 (magnetite) is an example of

(a) normal spinel structure

(b) inverse spinel structure

(c) fluoride structure

(d) anti fluorite structure

Ans (b)

  1. Which of the following crystals does not exhibit Frenkel defect?

(a) AgBr

(b) AgCl

(c) KBr

(d) ZnS

Ans (c)

  1. What type of stoichiometric defect is shown by ZnS?

(a) Schottky defect

(b) Frenkel defect

(c) Both Frenkel and Schottky defects

(d) Non-stoichiometric defect

Ans (b)

  1. Silver halides generally show

(a) Schottky defect

(b) Frenkel defect

(c) Both Frenkel and Schottky defects

(d) cation excess defect

Ans (c)

  1. Which of the following will have metal deficiency defect?

(a) NaCl

(b) FeO

(c) KCl

(d) ZnO

Ans (b)

  1. In which pair most efficient packing is present?

(a) hep and bcc

(b) hep and ccp

(c) bcc and ccp

(d) bcc and simple cubic cell

Ans (b)

  1. What is the effect of Frenkel defect on the density of ionic solids?

(a) The density of the crystal increases

(b) The density of the crystal decreases

(c) The density of the crystal remains unchanged

(d) There is no relationship between density of a crystal and defect present in it

Ans (c)

  1. In a Schottky defect

(a) an ion moves to interstitial position between the lattice points

(b) electrons are trapped in a lattice site

(c) some lattice sites are vacant

(d) some extra cations are present in interstitial space

Ans (c)

  1. To get n-type of semiconductor, germanium should be doped with

(a) gallium

(b) arsenic

(c) aluminium

(d) boron

Ans (b)

  1. p-type semiconductors are formed When Si or Ge are doped with

(a) group 14 elements

(b) group 15 elements

(c) group 13 elements

(d)group 18 elements

Ans (c)

  1. Which of the following conditions favours the existence of a substance in the solid state?

(a) High temperature

(b) Low temperature

(c) High thermal energy

(d) Weak cohesive forces

Ans (b)

  1. Which among the following will show anisotropy ?

(a) Glass

(b) NaBr

(c) Plastic

(d) Rubber

Ans (b)

  1. Which of the following forms a molecular solid when solidified ?

(a) Calcium fluoride

(b) Silicon dioxide

(c) Carbon dioxide

(d) Sodium chloride

Ans (c)

  1. The major binding force in diamond, silicon and quartz is ……………

(a) electrostatic force

(b) electrical attraction

(c) covalent bond force

(d) van der Waals force

Ans (c)

  1. Solid X is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it ?

(a) Ionic solid

(b) Covalent solid

(c) Metallic solid

(d) Molecular solid

Ans (b)

  1. Examples of few solids are given below. Find out the example which is not correctly matched.

(a) Ionic solids – NaCl, ZnS

(b) Covalent solids – H2,l2

(c) Molecular solids – H2O(s)

(d) Metallic solids – Cu, Sn

Ans (b)

  1. Which of the following solids is the structure of CsCl crystal ?

(a) Body centred cubic

(b) Simple cubic

(c) Face centred cubic

(d) Edge centred cubic

Ans (a)

  1. Which of the following does not represent a type of crystal system ?

(a) Triclinic

(b) Monoclinic

(c) Rhombohedral

(d) Isotropical

Ans (d)

  1. Which of the following primitive cells show the given parameters ?
    a # b # c, α = β = Y = 90°

(a) Cubic

(b) Tetragonal

(c) Orthorhombic

(d) Hexagonal

Ans (c)

  1. Which type of crystals contains more than one Bravais lattice ?

(a) Hexagonal

(b) Triclinic

(c) Rhombohedral

(d) Monoclinic

Ans (d)

  1. A metal crystallises into a lattice containing a sequence of layers as AB AB AB………………….. What percentage of voids are left in the lattice ?

(a) 72%

(b) 48%

(c) 26%

(d) 32%

Ans (c)

  1. In ccp arrangement the pattern of successive layers can be designated as …………

(a) AB AB AB

(b) ABC ABC ABC

(c) AB ABC AB

(d)  ABA ABA ABA

Ans (b)

  1. The coordination number of metal crystallising in a hexagonal close packing is ………

(a) 12

(b) 4

(c) 8

(d) 6

Ans (a)

  1. A crystalline structure has radius ratio (r, / r) in the range of 0.225 – 0.414. The coordination number and arrangement of anions around the cations are ………..

(a) 3, plane triangular

(b) 6, octahedral

(c) 4, tetrahedral

(d) 8, cubic

Ans (c)

  1. A crystal lattice with alternative +ve and -ve ions has radius ratio 0.524. The coordination number of lattice is …………

(a) 4

(b) 6

(c) 8

(d) 12

Ans (b)

  1. A solid AB has a rock salt structure. If radius of cation A+is 120 pm, what is the minimum value of radius of B+ anion

(a) 120 pm

(b) 240 pm

(c) 290 pm

(d) 360 pm

Ans (c)

  1. How many chloride ions are surrounding sodium ion in sodium chloride crystal ?

(a) 4

(b) 8

(c) 6

(d) 12

Ans (c)

  1. In NaCl structure, ……………

(a) all octahedral and tetrahedral sites are occupied

(b) only octahedral sites are occupied

(c) only tetrahedral sites are occupied

(d) neither octahedral nor tetrahedral sites are occupied.

Ans (b)

  1. NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ……

(a) high temperature

(b) high pressure

(c) high temperature and high pressure

(d) low temperature and low pressure.

Ans (b)

  1. Coordination numbers of Cs+and Cl– in CsCl crystal are ………….

(a) 8, 8

(b) 4,4

(c) 6,6

(d) 8,4

Ans (a)

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