Advertisements
Advertisements
प्रश्न
In which of the following structures coordination number for cations and anions in the packed structure will be same?
विकल्प
Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.
Ca2+ ions form fcc lattice and F– ions occupy all the eight tetrahedral voids of the unit cell.
O2– ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.
S2– ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.
Advertisements
उत्तर
Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.
Explanation:
NaCl crystals have rock salt structure having fee lattice in which Cl– ions are present at fee lattice points and face centre and Na+ occupies all the octahedral voids of given unit cell.
Where, coordination number of Na+ = 6
APPEARS IN
संबंधित प्रश्न
If the radius of the octahedral void is r and the radius of the atoms in close packing is R, derive the relation between r and R.
The unit cell of a substance has cations A+ at the corners of the unit cell and the anions B− at the center. The simplest formula of the substance is ____________.
A compound is formed by two elements A and B. The element B forms cubic close packing and atoms of A occupy `1/3"rd"` of tetrahedral voids. The formula of this compound is ____________.
What is the coordination number of sodium in Na2O?
The Ca2+ and F– are located in CaF2 crystal, respectively at face centered cubic lattice points and in ____________.
In which of the following crystals alternate tetrahedral voids are occupied?
In the hexagonal close-packed structure of a metallic lattice, the number of nearest neighbours of a metallic atom is ____________.
If Germanium crystallises in the same way as diamond, then which of the following statement is not correct?
In the cubic close packing, the unit cell has ______.
In which of the following arrangements octahedral voids are formed?
(i) hcp
(ii) bcc
(iii) simple cubic
(iv) fcc
The coordination number of Y will be in the XY types of crystal:
Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure?
(i) A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the first layer.
(ii) All the triangular voids are not covered by the spheres of the second layer.
(iii) Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangular shapes of these voids do not overlap.
(iv) Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar voids in the first layer.
The number of tetrahedral voids per unit cell in NaCl crystal is:
(i) 4
(ii) 8
(iii) twice the number of octahedral voids.
(iv) four times the number of octahedral voids.
Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
A solid compound XY has Nacl structure. If the radium of cation (X+) is 100 pm, the radium of anion (r–) will be:-
