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प्रश्न
What is the formula of a compound in which the element Y forms hcp lattice and atoms of X occupy 2/3rd of tetrahedral voids?
उत्तर
Suppose the number of atoms Y in hcp lattice = n
As the number of tetrahedral voids is double the number of atoms in close packing, the number of tetrahedral voids = 2n
As atoms X occupy 2/3rd of the tetrahedral voids, the number of atoms X in the lattice
`2/3xx2n=(4n)/3`
`:. "Ratio of X:Y"=(4n)/3:n=4/3:1=4:3`
Hence, the formula of the compound is X4Y3.
संबंधित प्रश्न
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 ____________.
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?
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:
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.
