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WorksheetsTHE SOLID STATE
Total questions: 30
Worksheet time: 24mins
The lattice parameters of a given crystal are a = 5.62 Å, b = 7.41 Å and c = 9.48 Å. The three coordinate axes are mutually perpendicular to each other. The crystal is :
tetragonal
orthorhombic
monoclinic
trigonal
In a face centered cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centres. One of the A atom Is missing from one corner in unit cell. The simplest formula of the compound is
A7B3
AB3
A7B24
A2B3
A metal crystallizes in two cubic phases i.e., FCC and BCC whose unit cell lengths are 3.5Å and 3.0Å respectively. The ratio of their densities is :
3.12
2.04
1.26
0.72
Lithium borohydride crystallizes in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are a = 6.8 Å, b = 4.4 Å and c=7.2 Å. If the molar mass is 21.76, then the density of crystals is :
0.6708 g cm–3
1.6708 g cm–3
2.6708 g cm–3
None of these
The numbers of tetrahedral and octahedral holes in a ccp array of 100 atoms are respectively
200 and 100
100 and 200
200 and 200
100 and 100
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be:
2√2 a
√2 a
a/√2
2a
A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8 g cm-3, then the number of atoms present in 256 g of the crystal is N × 1024. The value of N is
1
2
3
4
Which of the following compounds is metallic and ferromagnetic ?
CrO2
VO2
MnO2
TiO2
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately
1.85 Å
3.22 Å
5.72 Å
0.93 Å
If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are
1/2,1/8
1,1/4
1/2,1/2
1/4,1/8
A compound MpXq has cubic close packing (ccp) arrangement of X. Its unit cell structure is show below
MX4
M2X
M2X3
MX2
Analysis shows that a metal oxide has a empirical formula M0.96O. Calculate the percentage of M2+ and M3+ ions in this crystal.
[M2+ = 93.7%, M3+ = 6.3%]
[M2+ = 95.7%, M3+ = 4.3%]
[M2+ = 91.7%, M3+ = 8.3%]
[M2+ = 97.7%, M3+ = 2.3%]
The concentration of cation vacancies in AgCl crystal doped with CdCl2 is found to be 6.02 x 1016 mol–1. What is the concentration of CdCl2 added to it?
10–5 mol% CdCl2
10–4 mol% CdCl2
10–7 mol% CdCl2
10–6mol% CdCl2
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 present at body centre,the alloy has formula
Cu4Ag2Au
Cu4Ag4Au
Cu4Ag3Au
CuAgAu
Percentage of free space in a body centred cubic unit cell is
34
32
68
74
If NaCl is doped with 10–4 mol % of SrCl2, the concentration of cation vacancies will be (NA = 6.022 × 1023 mol–1)
6.022 X 1016mol-1
6.022 X 1017mol-1
6.022 X 1014 mol-1
6.022 X 1015 mol-1
Which of the following is incorrect
The defect is known as schottky defect
Density of compound in the defect decreases
NaCl(s) is example which generally shows this defect
Stoichiometry of compound will change slightly.
This defect is shown by ionic substances in which the cation and anion are of almost similar sizes
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
X3Y4
X4Y3
X2Y3
X2Y
The appearance of colour in solid alkali metal halides is generally due to
Schottky defect
Frenkel defect
Interstitial position
F-centres
How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.0 g?
5.14 × 1021 unit cells
1.28 × 1021 unit cells
1.71 × 1021 unit cells
2.57 × 1021 unit cell
Which of the following is an amorphous solid?
Graphite (C)
Quartz glass (SiO2)
Chrome alum
Silicon carbide (SiC)
Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances?
Which of the following is a network solid?
SO2(Solid)
I2(Solid)
Diamond
H2O(Ice)
Cations are present in the interstitial sites in __________.
Frenkel defect
Schottky defect
Vacancy defect
Metal deficiency defect
Schottky defect is observed in crystals when __________.
some cations move from their lattice site to interstitial sites.
equal number of cations and anions are missing from the lattice.
some lattice sites are occupied by electrons.
some impurity is present in the lattice.
To get a n-type semiconductor from silicon, it should be doped with a substance with valence__________.
5
2
1
3
Which of the following point defects are shown by AgBr(s) crystals?
(A) Schottky defect (B) Frenkel defect
(C) Metal excess defect (D) Metal deficiency defect
(A) and (B)
(C) and (D)
(A) and (C)
(B) and (D)
Which of the following statements is not true?
Paramagnetic substances are weakly attracted by magnetic field.
Ferromagnetic substances cannot be magnetised permanently.
The domains in antiferromagnetic substances are oppositely oriented with respect to each other.
Pairing of electrons cancels their magnetic moment in the diamagnetic substances.
1. KF has NaCl structure. If the distance between K+
and F- is 269 pm, find the density of KF (NA= 6.02X1023 mol-1 , atomic masses K=39,F=19 amu )
4.20gm. cm-3
5.48gm. cm-3
3.15gm. cm-3
2.48 gm. cm-3
An element crystallizes in a structure having f.c.c. unit cell of edge 200 pm . Calculate the density if 200g of this element contains 24 X 1023 atoms.
41.67gm.cm-3
51.67gm.cm-3
61.67gm.cm-3
71.67gm.cm-3
