|
What type of defect is produced when NaCl is doped with Sr$C{{l}_{2}}$?
|
|
0
|
2972
|
September 20, 2016
|
|
Agl crystallises in cubic close-packed ZnS structure. What fraction of tetrahedral sites is occupied by ${{Ag}^{+}}$ ions?
|
|
0
|
2970
|
September 20, 2016
|
|
Niobium crystallises in a body-centred cubic structure. If density is 8.55 g c${{m}^{-3}}$, calculate atomic radius of niobium using its atomic mass 93 u
|
|
0
|
1753
|
September 20, 2016
|
|
Why does Frenkel defect not change the density of AgCl crystal?
|
|
0
|
3152
|
September 20, 2016
|
|
What type of stoichiometric defect is shown by AgCl?
|
|
0
|
4381
|
September 20, 2016
|
|
What happens when ferrimagnetic ${{Fe}_{3}}$${{O}_{4}}$ is heated at 850 K and why?
|
|
0
|
649
|
September 20, 2016
|
|
Analysis shows that nickel oxide has the formula NiO. What fractions of the nickel exist as ${{Ni}^{2+}}$ and ${{Ni}^{3+}}$ ions?
|
|
0
|
1903
|
September 20, 2016
|
|
Why LiCl acquires pink colour when heated in Li vapours?
|
|
0
|
3710
|
September 20, 2016
|
|
Non-stoichiometric cuprous oxide
|
|
1
|
827
|
September 20, 2016
|
|
What change occurs wlien AgCl is doped with Cd$C{{l}_{2}}$?
|
|
1
|
693
|
September 20, 2016
|
|
If NaCl is doped with mole % of Sr$C{{l}_{2}}$, what is the concentration of the cation vacancies?
|
|
0
|
1095
|
September 20, 2016
|
|
Examine the given defective crystal:
|
|
1
|
6415
|
September 20, 2016
|
|
What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic? Justify your answer
|
|
0
|
2516
|
September 20, 2016
|
|
Write the type of magnetism observed when the
|
|
1
|
2961
|
September 20, 2016
|
|
Classify each of the following as being either a p-type or a ra-type semiconductor
|
|
1
|
1332
|
September 20, 2016
|
|
In terms of band theory, what is the difference
|
|
1
|
1802
|
September 20, 2016
|
|
Explain, how vacancies are introduced in an ionic solid when a cation of higher valency is added as an impurity in it?
|
|
0
|
853
|
September 20, 2016
|
|
Schottky defects generate an equal number of
|
|
1
|
1745
|
September 20, 2016
|
|
The crystal AB (rock salt structure) has molecular weight 6.023
|
|
1
|
2584
|
September 20, 2016
|
|
Ionic solids which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example
|
|
0
|
1578
|
September 20, 2016
|
|
Which solid is likely to be the best material tor converting sunlight into electricity?
|
|
0
|
1280
|
September 20, 2016
|
|
Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other
|
|
0
|
3110
|
September 20, 2016
|
|
Assign reasons for the following: Phosphorus doped silicon is a semiconductor
|
|
0
|
1926
|
September 20, 2016
|
|
Account for the following: Conductivity of silicon increases on doping it with phosphorus
|
|
0
|
3550
|
September 20, 2016
|
|
A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong?
|
|
0
|
655
|
September 20, 2016
|
|
What type of semiconductor is obtained when silicon is doped with arsenic?
|
|
0
|
1879
|
September 20, 2016
|
|
Solid solution of group 13 or group 15 impurities with the group 14 elements are found to exhibit unusual electrical properties. Why?
|
|
0
|
2064
|
September 20, 2016
|
|
Which other element may be added to silicon to make electrons available for conduction of electricity?
|
|
0
|
1341
|
September 20, 2016
|
|
How may the conductivity of an intrinsic semiconductor be increased?
|
|
0
|
4942
|
September 20, 2016
|
|
What is the effect of temperature on the conduction of semiconductors?
|
|
0
|
554
|
September 20, 2016
|