Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
(ii) 8
(iii) twice the number of octahedral voids.
Explanation:
NaCl has fee arrangement of CF ions. Thus,
Number of CF ions in packing per unit cell = 4
Number of tetrahedral voids = 2 × No. of particles present in close packing = 2 × 4 = 8
Number of tetrahedral voids = 2 × No. of octahedral voids
APPEARS IN
संबंधित प्रश्न
How will you distinguish between the following pair of terms?
Tetrahedral and octahedral voids
How many tetrahedral voids can exist per unit cell in a hexagonal close packing sphere?
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 ____________.
Total number of voids in 0.5 mole of a compound which forms hexagonal close packed structure 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 ____________.
The Ca2+ and F– are located in CaF2 crystal, respectively at face centered cubic lattice points and in ____________.
If AgI crystallises in zinc blende structure with I– ions at lattice points. What fraction of tetrahedral voids is occupied by Ag+ ions?
Percentages of free space in cubic close packed structure and in the body-centered packed structure are respectively:
In which of the following crystals alternate tetrahedral voids are occupied?
The number of octahedral voids present in a lattice is A. The number of closed packed articles, the number of tetrahedral voids generated is B the number of closed packed particles:
In the hexagonal close-packed structure of a metallic lattice, the number of nearest neighbours of a metallic atom is ____________.
In the cubic close packing, the unit cell has ______.
The coordination number of Y will be in the XY types of crystal:
Show that in a cubic close packed structure, eight tetrahedral voids are present per unit cell.
In which of the following structures coordination number for cations and anions in the packed structure will be same?
A compound is formed by two elements A and B. The element B forms a cubic close-packed structure and atoms of A occupy `1/3` of the tetrahedral voids. If the formula of the compound is AxBy then the value x + y is in the option:
