Home
Class 11
CHEMISTRY
The mineral haematite, Fe(2)O(3) consi...

The mineral haematite, ` Fe_(2)O_(3)` consists of a cubic close packed array of oxide ions with `Fe^(3+)` ions occupying intersitial positions. Predict whether the iron ions are in the octahdral or tetrahedral holes. Radius of ` Fe^(3+)` = 0.65Å .

Text Solution

Verified by Experts

` r_(+)//r_(-) = 0.65 Å / 1.45 Å `which lies in the range 0.414 - 0.732 Hence, ` Fe^(3+)` ions will be in the octahedral holes.
Promotional Banner

Topper's Solved these Questions

  • APPENDIX

    PRADEEP|Exercise 6 WHAT HAPPENS WHEN|1 Videos

  • APPENDIX

    PRADEEP|Exercise 7 WHAT HAPPENS WHEN|1 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    PRADEEP|Exercise Curiosity Questions|2 Videos

Similar Questions

Explore conceptually related problems

a. MgO has the structure of NaCl and TICI has the structure of CsCl . What are the coordiantion number of the ions in MgO and TICI ? If the closed-packed cations in an XY -type solid have a raidus of 73.2 pm, what would be the maximum and minimum sizes of the anions filling voids? c. Fe_(2)O_(3) (haematite) forms ccp arrangement of O^(2-) ions with Fe_(3+) ions occupying initerstitial positions. Predict whether fe^(3+) ions are in the OV or TV . Given r_(Fe^(3+)) = 0.7 Å and r_(O^(2-)) = 1.4 Å d. A solid XY has CsCl -type structure. The edge length of the unit cell is 400 pm Calculate the distance of closest approach between X^(o+) and Y^(ɵ) ions.

A solid crystallinses as cubic close packing of O^(2-) ions. A^(x+) ions occupy 25% of the tetrahedral voids and B^(y+) ions occupy 50% of the octahedral voids. The suitable values of x and y are:

Ferric oxide crystalliizes in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

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 magnesiums ions, m and n respectively, are