Ionic Compounds and Radius Ratios
Trending Questions
If the radius of ion is, how large can a cation be fit in its tetrahedral holes?
The range of radius ratio for tetrahedral coordination will be:
0.225 - 0.414
0.414 – 0.732
both are just fine
If the closed packed cations in an AB type crystal has a radius of 75 pm. What would be the maximum and minimum size of the anions filling the void.
rmin=102.5pm, rmax=181.2pm
rmin=10.5pm, rmax=181.2pm
rmin=12.5pm, rmax=181.2pm
rmin=102.5pm, rmax=81.2pm
If the radius ratio is between 0.225 - 0.414, what will be the type of void present. What will be the coordination number?
linear
tetrahedral - 4
tetrahedral - 2
octahedral
- Diffusion of sodium ions
- Oscillation of mobile valence electrons
- Existence of free protons
- Existence of body centred cubic lattice
Choose the correct option(s):
- Fraction of total voids occupied=19
- Fraction of total voids occupied=16
- Fraction of octahedral voids occupied=12
- Fraction of octahedral voids occupied=13
Given that rNa+rCl−=0.5 and rK+rCl−=0.65 Then the ratio of the side of the unit cells for KCl to that of NaCl is:
- 1.3
- 3.3
- 1.65
- 1.1
If the radius ratio is between 0.414 - 0.732, what will be the type of void present? What will be the coordination number?
Tetrahedral - 4
Linear - 2
Octahedral - 6
Cubic - 8
- Greater than 0.73
- In between 0.73 and 0.41
- In between 0.41 and 0.22
- Less than 0.22
- Cubic
- Octahedral
- Tetrahedral
- Fcc
Given that rNa+rCl−=0.5 and rK+rCl−=0.65 Then the ratio of the side of the unit cells for KCl to that of NaCl is:
- 1.3
- 3.3
- 1.65
- 1.1
- Coordination number of A2+ in the compound AB is 4
- Coordination number of A2+ in the compound AB is 6
- Coordination number of C+ in the compound CD is 6
- Coordination number of C+ in the compound CD is 8