Which one of the following is non-crystalline or amorphous?
  • Diamond
  • Graphite
  • Glass
  • Common Salt
NaCl typecrystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying
  • high temperature
  • high pressure
  • high temperature and high pressure
  • low temperature and low pressure
How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
  • 4
  • 8
  • 6
  • 12
In NaCl structure
  • all octahedral and tetrahedral sites are occupied
  • only octahedral sites are occupied
  • only tetrahedral sites are occupied
  • neither octahedral nor tetrahedral sites are occupied
In Zinc blende structure
  • zinc ions occupy half of the tetrahedral sites
  • each Zn
  • each S
  • it has fee structure
Alkali halids do not show Frenkel defect because
  • cations and anions have almost equal size
  • there is a large difference in size of cations and anions
  • cations and anions have low coordination number
  • anions cannot be accommodated in voids
The coordination number of Y will be in the XY types of crystal:
  • 6
  • 8
  • 12
  • 4
The fraction of the total volume occupied by the atoms present in a simple cube is
  • \(\frac{π}{4}\)
  • \(\frac{π}{6}\)
  • \(\frac{π}{3√2}\)
  • \(\frac{π}{4√2}\)
Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order
  • 287 pm
  • 574 pm
  • 124.27 pm
  • 143.5 pm
The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is
  • 110 pm
  • 220 pm
  • 285 pm
  • 144 pm
The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol
  • 10 g cm
  • 14.2 g cm
  • 6.15 g cm
  • 9.3 2 g cm
How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 g cm
  • 2
  • 1
  • 4
  • 6
The distance between Na
  • 564 pm
  • 282 pm
  • 234 pm
  • 538 pm
An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is
  • 10.37 g cm
  • 5.19 g cm
  • 7.29 g cm
  • 2.14 g cm
Fe
  • normal spinel structure
  • inverse spinel structure
  • fluoride structure
  • anti fluorite structure
Which of the following crystals does not exhibit Frenkel defect?
  • AgBr
  • AgCl
  • KBr
  • ZnS
What type of stoichiometric defect is shown by ZnS?
  • Schottky defect
  • Frenkel defect
  • Both Frenkel and Schottky defects
  • Non-stoichiometric defect
Silver halides generally show
  • Schottky defect
  • Frenkel defect
  • Both Frenkel and Schottky defects
  • cation excess defect
Which of the following will have metal deficiency defect?
  • NaCl
  • FeO
  • KCl
  • ZnO
In which pair most efficient packing is present?
  • hep and bcc
  • hep and ccp
  • bcc and ccp
  • bcc and simple cubic cell
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