CBSE
A forms hcp lattice and B are occupying 1/3rd of tetrahedral voids, then the formula of compound is
AB
A3B2
A2B3
AB4
Among the following, the compound that is both paramagnetic and coloured is
K2Cr2O7
(NH4)2[TiCl6]
VOSO4
K3[Cu(CN)4]
A compound CuCl has face-centred cubic structure. Its density is 3.4 g cm-3 , The length of unit cell is:
8.734
5.834
5.783
8.153
The crystal with metal deficiency defect is :
NaCl
FeO
KCl
ZnO
Frenkel and Schottky defects are
nucleus defects
non-crystal defects
crystal defects
nuclear defects
In the crystal of CsCl, the co-ordination number changes from 8:8 to 6:6 by:
applying high pressure
applying low temperature
applying high temperature
applying low pressure
If an atom crystallises in bee lattice with r= 4 Å then the edge length will be
2 Å
8 Å
2.39 Å
9.23 Å
If the positions of Na+ and Cl- are interchanged in NaCl , the crystal lattice with respect to Na+ and CI- is:
bcc and fcc
fcc and bcc
both fcc
both bcc
A mineral having the formula AB2 crystallizes in the cubic close-packed lattice , with the A atoms occupying the lattice points. The fraction of the tetrahedral sites occupied by B atoms is :
20 %
40 %
60 %
100 %
ZnO is white when cold and yellow when heated. It is due to the development of
Frenkel defect
metal excess defect
Schottky defect
metal deficiency defect.