|
What makes the alkali metal halides sometimes coloured which are otherwisevcolourless?
|
|
0
|
2950
|
September 20, 2016
|
|
Give an example of ionic compound which shows Schottky defect
|
|
0
|
630
|
September 20, 2016
|
|
What is the effect of Frenkel defect on electrical conductivity of solid?
|
|
0
|
2218
|
September 20, 2016
|
|
Why is the Frenkel defect not found in pure alkali metal halides?
|
|
0
|
1244
|
September 20, 2016
|
|
What is the effect on the density of a crystal due to Schottky defect?
|
|
0
|
1813
|
September 20, 2016
|
|
Name the type of point defect that occurs in a crystal of zinc sulphide
|
|
0
|
3294
|
September 20, 2016
|
|
What type of stoichiometric defect is shown by (i) ZnS? (ii) AgBr?
|
|
0
|
890
|
September 20, 2016
|
|
Which stoichiometric defect in crytals, increases the density of a solid?
|
|
0
|
1500
|
September 20, 2016
|
|
What type of defect will arise when a solid is heated? Which physical property is affected by it and in what way?
|
|
0
|
710
|
September 20, 2016
|
|
Aluminium crystallises in a cubic closed packed structure
|
|
1
|
1048
|
September 20, 2016
|
|
An element occurs in bcc structure. It has a cell
|
|
1
|
5534
|
September 20, 2016
|
|
An element crystallises in fee lattice having edge length 400 pm
|
|
1
|
2133
|
September 20, 2016
|
|
If the radius of the octahedral void is r and radius of the atoms in close packing is R, derive a relation
|
|
1
|
11287
|
September 20, 2016
|
|
Copper crystallises into a fee lattice with edge
|
|
1
|
723
|
September 20, 2016
|
|
An element with density 2.8 g c${{m}^{-3}}$ forms an fee unit cell with edge length
|
|
1
|
1941
|
September 20, 2016
|
|
Ferric oxide crystallises in a hexagonal close
|
|
1
|
665
|
September 20, 2016
|
|
What is the coordination number of atoms
|
|
1
|
817
|
September 20, 2016
|
|
An alloy of gold and cadmium crystallises with a cubic structure in which gold atoms occupy the corners and cadmium atoms fit into the face centres. Assign formula for this alloy
|
|
0
|
11673
|
September 20, 2016
|
|
A cubic solid is made up of two elements P and Q
|
|
1
|
5210
|
September 20, 2016
|
|
Explain, how much portion of an atom
|
|
1
|
1226
|
September 20, 2016
|
|
Aluminium crystallises in a fee structure. Atomic radius of the metal is 125 pm. What is the length of the side of the unit cell of the metal?
|
|
0
|
479
|
September 20, 2016
|
|
Which of the following lattices has the highest packing efficiency?
|
|
1
|
940
|
September 20, 2016
|
|
What happens to a sodium chloride structure when high pressure is applied to it?
|
|
0
|
2123
|
September 20, 2016
|
|
What is the coordination number of each type of ions in a rock salt type crystal structure?
|
|
0
|
2503
|
September 20, 2016
|
|
A compound is formed by two elements ‘M and ‘N. The element forms ‘ccp’ and atoms of ‘M occupy l/3rd of tetrahedral voids. What is the formula of the compound?
|
|
0
|
488
|
September 20, 2016
|
|
What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 1/3rd of tetrahedral voids?
|
|
0
|
1803
|
September 20, 2016
|
|
What makes a glass different from a solid such as quartz? Under whal conditions could quartz be converted into glass?
|
|
0
|
607
|
September 20, 2016
|
|
What is the maximum radius of a sphere that can be filled in a tetrahedral void of cubic close packing of spheres of radius R without disturbing the packing?
|
|
0
|
1728
|
September 20, 2016
|
|
What is the two dimensional coordination number of a molecule in square close-packed layer?
|
|
0
|
758
|
September 20, 2016
|
|
How many atoms constitute one unit cell of a face-centred cubic crystal?
|
|
0
|
2836
|
September 20, 2016
|