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How will you distinguish between the fol...

How will you distinguish between the following pairs of terms?
(i) Hexagonal close-packing and cubic close-packing
(ii) Crystal lattice and unit cell
(iii) Tetrahedral void and octahedral void

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Distinguish between the following pairs of terms Hexagonal close packing and cubic close packing

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In the cubic close packing, the unit cell has-

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Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is the maximum and the contituents occupy the maximum available space. In two dimensions, there are hexagonal close packing and cubic close packing. In three dimentions, there are hexagonal, cubic as well as body centred close packings. A certain oxide of a metal M crystallises in such a way that O^(2-) ions occupy hcp arrangement following ABAB... pattern. The metal ions however occupy 2//3 rd of the octahedral voids. The formula of the compound is :

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  7. Silver crystallises in fcc lattice. If edge length of the cell is 4.07...

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  8. A cubic solid is made of two elements P and Q. Atoms of Q are at the c...

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  9. Niobium crystallises in body-centred cubic structure. If density is 8....

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  10. If radius of the octahedral void is r, radius of the atom in close pac...

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  11. Copper crystallises into a fcc lattice with edge length 3.61xx10^(-8)c...

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  15. Ferric oxide crystallises in a hexagonal close-packed array of oxide i...

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  16. Classify each of the following as being either a p-type or a n-type se...

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  17. Gold (r = 0.144nm) crystallises in a face-centred unit cell. What is t...

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