2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th January Evening Slot
At 100oC, copper (Cu) has FCC unit cell structure with cell edge length of x $\mathop A\limits^o $. What is the approximate density of Cu (in g cm$-$3) at this temperature?
[Atomic Mass of Cu = 63.55 u]
[Atomic Mass of Cu = 63.55 u]
A.
${{205} \over {{x^3}}}$
B.
${{105} \over {{x^3}}}$
C.
${{211} \over {{x^3}}}$
D.
${{422} \over {{x^3}}}$
2018
JEE Mains
MCQ
JEE Main 2018 (Offline)
Which type of ‘defect’ has the presence of cations in the interstitial sites?
A.
Metal deficiency defect
B.
Schottky defect
C.
Vacancy defect
D.
Frenkel defect
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Evening Slot
All of the following share the same crystal structure except :
A.
LiCl
B.
NaCl
C.
RbCl
D.
CsCl
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Morning Slot
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance ?
A.
B.
C.
D.
2017
JEE Mains
MCQ
JEE Main 2017 (Offline)
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 :
A.
$2\sqrt 2 a$
B.
$\sqrt 2 a$
C.
${a \over {\sqrt 2 }}$
D.
2a
2015
JEE Mains
MCQ
JEE Main 2015 (Offline)
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Ã… . The radius of
sodium atom is approximately :
A.
5.72 Ã…
B.
0.93 Ã…
C.
1.86 Ã…
D.
3.22 Ã…
2014
JEE Mains
MCQ
JEE Main 2014 (Offline)
CsCl crystallises in body centred cubic lattice. If ‘a’ is its edge length then which of the following
expressions is correct?
A.
${r_{C{s^ + }}} + {r_{C{l^ - }}} = {{\sqrt 3 } \over 2}a$
B.
${r_{C{s^ + }}} + {r_{C{l^ - }}} = {3 \over 2}a$
C.
${r_{C{s^ + }}} + {r_{C{l^ - }}} = \sqrt 3 a$
D.
${r_{C{s^ + }}} + {r_{C{l^ - }}} = 3a$
2013
JEE Mains
MCQ
JEE Main 2013 (Offline)
Which of the following exists as covalent crystals in the solid state?
A.
Silicon
B.
Sulphur
C.
Phosphorous
D.
Iodine
2012
JEE Mains
MCQ
AIEEE 2012
Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius
of the lithium will be :
A.
75 pm
B.
300 pm
C.
240 pm
D.
152 pm
2011
JEE Mains
MCQ
AIEEE 2011
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre
positions. If one atom of B is missing from one of the face centred points, the formula of the compound is :
A.
AB2
B.
A2B3
C.
A2B5
D.
A2B
2010
JEE Mains
MCQ
AIEEE 2010
Percentages of free space in cubic close packed structure and in body centred packed structure are
respectively :
A.
30% and 26%
B.
26% and 32%
C.
32% and 48%
D.
48% and 26%
2010
JEE Mains
MCQ
AIEEE 2010
The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the
cation is 110 pm, the radius of the anion is :
A.
288 pm
B.
398 pm
C.
618 pm
D.
144 pm
2009
JEE Mains
MCQ
AIEEE 2009
Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?
A.
108 pm
B.
127 pm
C.
157 pm
D.
181 pm
2008
JEE Mains
MCQ
AIEEE 2008
In a compound atoms of element Y from ccp lattice and those of element X occupy 2/3rd of tetrahedral
voids. The formula of the compound will be :
A.
X4Y3
B.
X2Y3
C.
X2Y
D.
X3Y4
2006
JEE Mains
MCQ
AIEEE 2006
Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius) :
A.
20/3 $\pi r^3$
B.
24/3 $\pi r^3$
C.
16/3 $\pi r^3$
D.
12/3 $\pi r^3$
2005
JEE Mains
MCQ
AIEEE 2005
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B
ions on the centres of the faces of the cube. The empirical formula for this compound
would be :
A.
AB
B.
A2B
C.
AB3
D.
A3B
2004
JEE Mains
MCQ
AIEEE 2004
What type of crystal defect is indicated in the diagram below?
A.
Interstitial defect
B.
Schottky defect
C.
Frenkel defect
D.
Frenkel and Schottky defects
2003
JEE Mains
MCQ
AIEEE 2003
How many unit cells are present in a cubeshaped ideal crystal of NaCl of mass 1.00 g?
[Atomic masses: Na = 23, Cl = 35.5]
A.
5.14 $\times$ 1021 unit cells
B.
1.28 $\times$ 1021 unit cells
C.
1.71 $\times$ 1021 unit cells
D.
2.57 $\times$ 1021 unit cells
2002
JEE Mains
MCQ
AIEEE 2002
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.
4 and 2
B.
9 and 14
C.
14 and 9
D.
2 and 4