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1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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
2
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
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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 :
A
5.72 Å
B
0.93 Å
C
1.86 Å
D
3.22 Å
3
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
$${r_{C{s^ + }}} + {r_{C{l^ - }}} = 3a$$
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following exists as covalent crystals in the solid state?
A
Silicon
B
Sulphur
C
Phosphorous
D
Iodine
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