Which of the following expressions is correct in case of a CsCl unit cell (edge length 'a')?
02Medium42×since 2002Q1933
The correct relationships between unit cell edge length 'a' and radius of sphere 'r' for face-centred and body-centred cubic structures respectively are :
03Easy42×since 2002Q1934
Which type of ‘defect’ has the presence of cations in the interstitial sites?
04Easy42×since 2002Q1935
Which of the following compounds is likely to
show both Frenkel and Schottky defects in its
crystalline form?
05Hard42×since 2002Q1936
Given below are two statements.
Statement I : Frenkel defects are vacancy as well as interstitial defects.
Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres.
Choose the most appropriate answer for the statements from the options given below :
06Easy42×since 2002Q1937
The incorrect statement about the imperfections in solids is :
07Medium42×since 2002Q1938
An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance
between the centres of two nearest octahedral voids in the crystal lattice is :
08Easy42×since 2002Q1939
How many unit cells are present in a cubeshaped ideal crystal of NaCl of mass 1.00 g?
[Atomic masses: Na = 23, Cl = 35.5]
09Easy42×since 2002Q1940
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B
ions on the centres of the faces of the cube. The empirical formula for this compound
would be :
10Easy42×since 2002Q1941
The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the
cation is 110 pm, the radius of the anion is :