1
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
An element crystallises in a face-centred cubic (fcc) unit cell with cell edge $$a$$. The distance between the centres of two nearest octahedral voids in the crystal lattice is :
A
$$a$$
B
$${a \over 2}$$
C
$${a \over {\sqrt 2 }}$$
D
$${\sqrt 2 a}$$
2
JEE Main 2020 (Online) 5th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
A diatomic molecule X2 has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule is 6.17 g cm–3. The number of molecules present in 200 g of X2 is :
(Avogadro constant (N A) = 6 $$ \times $$ 1023 mol–1 )
A
8 NA
B
40 NA
C
4 NA
D
2 NA
3
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :
A
Mercury
B
Carbon tetrachloride
C
Zinc sulphide
D
Silicon carbide
4
JEE Main 2020 (Online) 8th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?
A
CsCl
B
AgBr
C
ZnS
D
KBr
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