At 100^oC, copper (Cu) has FCC unit cell structure with cell edge length of x Ao. What is the approximate density of Cu (in g cm^−3) at this temperature?
[Atomic Mass of Cu = 63.55 u]
02Easy42×since 2002Q1921
Which premitive unit cell has unequal edge lengths (a = b = c) and all axial angles different from 90^o?
03Easy42×since 2002Q1922
A solid having density of 9×10³ kg m^–3 forms face centred cubic crystals of edge length 2002 pm. What is the molar mass of the solid?
[Avogadro constant ≅ 6 × 10²³ mol^–1
, π≅ 3]
04Easy42×since 2002Q1923
The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is : (Edge length is represented by 'a')
05Medium42×since 2002Q1924
Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms
occupy all the tetrahedral voids, The structure of bimetallic oxide is :
06Medium42×since 2002Q1925
10 mL of 1mM surfactant solution forms a
monolayer covering 0.24 cm² on a polar
substrate. If the polar head is approximated as
cube, what is its edge length?
07Easy42×since 2002Q1926
An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of
two nearest tetrahedral voids in the lattice is :
08Easy42×since 2002Q1927
The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic
structure are, respectively :
09Medium42×since 2002Q1928
A diatomic molecule X₂
has a body-centred cubic
(bcc) structure with a cell edge of 300 pm. The
density of the molecule is 6.17 g cm^–3. The number
of molecules present in 200 g of X₂
is :
(Avogadro constant (N
_A) = 6 × 10²³ mol^–1
)
10Easy42×since 2002Q1929
The parameters of the unit cell of a substance are a = 2.5, b = 3.0, c = 4.0, α = 90∘, β = 120∘, γ = 90∘. The crystal system of the substance is :