In this blog I provide solid state chapter past year's questions with answer.
In very simple language. This questions are very helpful for entrance exam like Mht cet.
And follow this blog for past years questions of entrance exam.
*Past years questions with answer:
Solid state Previous years questions Paper Pdf Download:
1) The percentage of unoccupied volume in simple cubic cell is
[Mht cet 2019]
a) 15.240
b) 23.200
c) 34.760
d) 47.600
Ans:
Since a simple cubic unit cell contains only 1 atom. The packing efficiency of the simple cubic cell is 52.4 %. Thus 47.6 % volume is empty space (void space) i.e. almost half the space is empty.
that's why option (c) is right.
(2) Which among the following shows frenkel defect. [Mht cet 2019]
a) Nacl
b) Kcl
c) Cscl
d) Agcl
Ans:
Frenkel defect is shown by the compounds in which cation is smaller than anion.
In the case of this cation move inside the lattice and form a cavity at its original place. AgCl,AgBr Shows Frenkel defect.
That's why option (d) is right.
(3) In which among the following solids, Schottky's defects is not observed. [Mht cet 2018]
a) ZnS
b) Nacl
c) Kcl
d) Cscl
Ans:
The Schottky defect is not observed in ZnS. The Schottky defect is observed in NaCl, KCl and CsCl.
The Schottky defect is observed in solids in which cations and anions have almost equal size.
That's why option (a) is right
(4) Which symbol replace the unit of atomic mass, amu? [Mht cet 2018]
a) u
b) A
c) M
d) n
Ans:
The symbol 'u' replaces the unit of atomic mass, amu.
For example, Atomic mass of carbon-12 is written as 12 u.
That's why option (a) is right.
(5) Which element among the following does not from diatomic molecules. [Mht cet 2017]
a) Argon
b) Oxygen
c) Nitrogen
d) Bromine
Ans:
Argon is an inert gas (noble gas). It is chemically unreactive. It does NOT form diatomic molecules.
that's why option (a) is right
(6) What is hybridization of carbon atoms in fullerence ? [Mht cet 2017]
a) Sp3
b) Sp
c) Sp2
d) dap3
Ans:
Hybridisation of carbon in fullerene is sp2.
that's why option (c) is right.
(7) Which metal crystallieses in simple cubic structure ? [Mht cet 2016]
a) Polonium
b) Copper
c) Nickel
d) Iron
Ans:
Polonium crystallizes as simple cube. Iron crystallizes as BCC unit cell. Copper and gold crystallizes as FCC unit cell.
that's why option (a) is right
(8) In face centered cubic unit cell, what is volume occupied?[Mht cet2016]
a) 4/3πr3
b) 8/3πr3
c) 16/3πr3
d) 64/3√(3)r3
Ans:
In fcc unit cell, no. of atoms are =[6×21]+[8×81]=4
Volume of 1 spherical atom is 34πr3.
Hence ,volume occupied by atoms in fcc unit cell will be 4×34πr3=316πr3, where, r is radius of atom.
That's why option (c) is right
(9) Select a ferromagnetic material from the following. [Mht cet 2015]
a) Dioxygen
b) Chromium (IV) oxide
c) Benzene
d) Dihydrogen
Ans:
Chromium (IV) dioxide is considered to be ferromagnetic. The ferromagnetic properties of these compounds allow them to be used in data tape, a way to store information.
that's why option (b) is right.
(10) Which metal among the following has the highest packing efficiency? [Mht cet 2015]
a) Iron
b) Tungsten
c) Aluminum
d) Polonium
Ans:
he packing efficiency is is the fraction of volume in a crystal structure that is occupied by constituent particles (volume of space occupied by the spheres/total volume).
The majority of metals take on either the hcp or bcc structure.
Among the given metals Al occupies hexagonal close-packed (hcp) is having 0.74 packing efficiency and other metals form body-centered cubic (bcc) which has 0.68 packing efficiency.
that's why option (c) is right.
(11) The vacant space in bcc lattice unit cell is [AIPMT 2015]
a) 48%
b) 23%
c) 32%
d) 26%
Ans:
Packing fraction of BCC unit cell is 68%. Therefore, the vacant space in BCC unit cell is 32%.
that's why option (c) is right.
(12) sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 A . The radius of sodium atom is approximately. [Jee main 2015]
a) 1.86
b) 3.22
c) 5.72
d) 0.92
Ans:
In bcc structure, the radius of sodium atom is 0.433a=0.433×4.29 A˚=1.86 A˚
that's why option (a) is right.
(13) Which statement is not correct about fullerene C60. [Mht cet 2014]
a) It contains 20 six- membered rings and 12 five- membered rings
b) All carbon atom undergoes SP2 hybridization
c) A six membered ring is fuse with 6 membered ring only
d) A 5 memberd ring is fused with 6 membered ring only
Ans:
C60 (fullerene) looks like a soccer ball and contains 20 six membered rings and 12 five membered rings of carbon atoms.
Six membered rings are fused with both six membered as well as five membered rings while five membered rings are attached only with six membered rings.
that's why option (c) is right.
(14) Which among the following solids crystallizes as a free centred cube? [Mht cet 2014]
a) Iron
b) Rubidium
c) Uranium
d) Platinum
Ans:
S.No.ElementType of packing
A. Fe -bcc
B. BR-bcc
C. U - bcc
D. Pt-fcc
that's why option (d) is right.
(15) The number of carbon atoms per unit cell of diamond unit cell is. [Neet 2013]
a) 6
b) 1
c) 4
d) 8
Ans:
Diamond has fcc unit cell structure made up of atoms.
This accounts for 8×81+6×21=1+3=4 C atoms
C atoms are also present in one half of the tetrahedral voids.
There are 8 tetrahedral voids in fcc structure.
This accounts for remaining 8×21=4 C atoms
Thus, total 4+4=8 C atoms are present per unit cell of diamond.
that's why option (b) is right.
(16) A metal crystallizes with a face- Centred cubic lattice.The edge of the unit cell is 408 pm.the diameter of the metal atom is [AIPMT 2013]
a) 228 pm
b) 408 pm
c) 144 pm
d) 204 pm
Ans:
In face centred cubic unit cell (fcc) :
r = 22a
a = 408 pm
r = 22408
r = 144 pm
Diameter = 2r = 2×144 = 288 pm
that's why option (a) is right.
(17) The number of octahedral void (s) per atom present in a cubic close-packed structure is [AIPMT 2012]
a) 1
b) 3
c) 2
d) 4
Ans:
As we know, in any type of close packing, one octahedral void is attached with one atom. In cubic close packing, there is 1 atom and so, it has one octahedral void
that's why option (a) is right.
Past years questions for practice:
(1) In halide of magnesium has highest ionic character? [Mht cet 2016]
a) Chloride
b) Bromide
c) Iodide
d) Fluoride
(2) Which among the following solid is a non polar solid? [Mht cet 2016]
a) Hydrogen chloride
b) Sulphur dioxide
c) Water
d) carbon dioxide
*Answer of above past years questions
(1)-d
(2)-d
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