Advertisements
Advertisements
Question
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.
Advertisements
Solution
(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.
Explanation:
Tetrahedral voids are formed when the triangular void in the second layer lie exactly above the triangular voids in the first layer and the triangular shape of these voids oppositely overlap.
Octahedral voids are formed when triangular void of second layer is not exactly overlap with similar void in first layer.
APPEARS IN
RELATED QUESTIONS
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?
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?
Which set of following characteristics for ZnS crystal is correct?
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 cubic close packing, the unit cell has ______.
The coordination number of Y will be in the XY types of crystal:
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.
In a compound, nitrogen atoms (N) make cubic close packed lattice and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N?
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:-
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:
