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For a face centered cubic lattice, the miller indices for the first Bragg’s (smallest Bragg angle):
A crystal has the lattice parameters a ≠ b ≠ c and α = β = γ = 90^{0}. The crystal system is:
A metal crystallizes in facecentered cubic lattice with a lattice parameter of 4.20 Å. The shortest atom to atom contact distance in the lattice is:
Molybdenum crystallizes in a bccstructure with unit cell dimensions of 0.314 nm. Considering the atomic mass of molybdenum to be 96, its density (in kg m^{–3}) is in the range of:
For a simple cubic crystal lattice, the angle between the [201] plane and the xy plane is:
For a simple cubic lattice, the ratio between the unit cell length and the separation of two adjacent parallel crystal planes can NOT have a value of:
The unit cell of diamond can be obtained from the unit cell of:
The defect that results when electrons are trapped in an ionic crystal lattice in place of an anion valancy is known as:
Iron (II) oxide, FeO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm^{–3}. Calculate the no. of Fe^{2+} and O^{2–} ions present in each unit cell.
Calculate the miller indices of crystal planes which cut through the crystal axis at (2a, –3b, –3c):
Calcium fluoride crystallizes in fluorite structure. The coordination no. for the cation and anion is respectively:
The atomic radius (in cm) of an element with a body centred cubit unit cell of molecular weight 137.3 and density 3.62 g cm^{–3} is:
Which one of the following plane will show allowed reflection for any FCC:
There are two crystal lattice A and B
A: Diffracts from (200) and (111) plane but not from (110)
B: Diffracts from (110) and (100) plane but not from (111)
A metal crystallizes with a facecentered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is
The second order brags diffraction from the (100) planes of a cubic crystal is equivalent to:
⟶ NH_{4}I and MgO crystallizes in rock salt structure (NaCl(NaCl Type)Type) where NH^{+4 }and Mg^{+2 }occupies all octahedral voids and I^{−} and O^{2−} forms FCC lattice having coordination number 6:6
⟶ MnO also have 6:6 coordination as Mn^{+2 }forms FCC lattice and O^{2−} occupies all tetrahedral voids.
(Inverse of NaCl structure)
⟶ ZnS have 4:4 coordination as Zn^{+} occupies alternate tetrahedral voids and O^{2−} forms FCC lattice.
The correct statement(s) regarding defects in solids is (are):
If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively are:
The correct statement(s) for cubic close packed (ccp) three dimensional structure is (are):
Numerical Answer type (Q. No. 2830)
Silver (atomic weight = 108 g mol^{–1}) has a density of 10.5 g cm^{–3}. The no. of silver atoms on a surface of area 10^{–12} m^{2} can be expressed in scientific rotation as Y × 10^{x}. The value of x is…..:
The no. of particle present in octahedral void in ZnS (Blend) structure is:
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